Seeing the (LED) light

There is something of an evangelical fervour about the way public lighting authorities are installing new LED lighting on our streets and roads across the UK.

But in the rush to cut power consumption and save money long-term, our public authorities and the lighting industry itself may be turning a blind eye to serious health risks posed by this new technology.

Increased risks of cancer, diabetes and cardiovascular disease is hardly being championed by the lighting companies that market and promote the benefits of light emitting diodes (LEDs).

A report released this summer by the American Medical Association (AMA) Council on Science and Public Health confirms suspected impacts to human health and the environment caused by excessive amounts of blue light.

‘Human and Environmental Effects of Light Emitting Diode Community Lighting’ presents significant implications for the ongoing, worldwide transition to LEDs as the outdoor lighting technology of choice.

While it supports the use of LED lighting in order to reduce energy consumption and the use of fossil fuels, it also recognises that some LED lights are harmful.

The report details findings from an increasing body of scientific evidence that implicates exposure to blue-rich white light at night to increased risks for cancer, diabetes and cardiovascular disease.

Blue-rich white LED street lighting can be five times more disruptive to our sleep cycle than conventional street lighting, according to the report.

Recent large surveys have documented that brighter residential night-time lighting is associated with reduced sleep, impaired daytime functioning and a greater incidence of obesity.

As a result of a potential risk to public health from excess blue light exposure, the AMA report encourages attention to optimal design and engineering features when converting from existing lighting technologies to LED.

These include requiring properly shielded outdoor lighting, considering adaptive controls that can dim or extinguish light at night, and limiting the correlated colour temperature (CCT) of outdoor lighting to 3000 Kelvin (K) or lower.

Colour temperature is a measure of the spectral content of light, and higher CCT values indicate a greater amount of blue light.

"This is a timely and important policy statement by the AMA," says Richard Stevens, a cancer epidemiologist at the University of Connecticut School of Medicine and co-author of the report.

"As with most new technology, everyone is enamoured at first because it's so great and does so much for us, but the downsides eventually become apparent. Electric light has great attributes, but we now realise, when poorly used and abused, there are also many problems."

The AMA findings also underscores the fact that detrimental effects of blue-rich LED lighting are not limited to humans.

 “Other species are just as vulnerable to disruption of their circadian rhythms as are humans, and often more so,” explains Travis Longcore, Assistant Professor of Architecture, Spatial Sciences, and Biological Sciences at the University of Southern California.

“Those impacts and others can be reduced by limiting blue-light emissions. Policy makers, government officials, and the American public now have the science and the imprimatur of the AMA to insist that LED installations be designed to reduce impacts on wildlife and human health.”

The issue is an important one and we should have the confidence that it is being properly addressed by those in the UK responsible for our night-time lighting - including local authorities, public bodies and the lighting industry itself.

Light of the world

Experts from around the globe gathered at Leicester’s De Monfort University in the UK this week to discuss ‘artificial light’ and how it is not only affecting the world we live in but is also increasingly helping define it.

The fact that light at night affects us adversely more than we might think is not something many of us give a second thought to - let alone consider it necessary to be discussed at an international conference.

But those at ALAN 14 - the second ‘Artificial Light at Night’ annual conference - had a significantly different take and highlighted a number of concerns that need to be taken seriously.

The scientists and researchers had travelled from the different parts of the UK, Ireland, the United States, Europe and Australia to present their findings on light-related topics and related research across the fields of health, biology, pollution, ecology, technology and design.

ALAN 2014 examined the use of artificial lighting at night in all its forms, as well as the spectrum of adverse effects that artificial light at - known collectively as light pollution - night may cause.

The theme coming through loud and clear is that society at large is barely beginning to recognising that such liberal and indiscriminate use of illumination is at a mounting cost to both the environment and ourselves.

Interestingly, an increasing number of scientific studies are now seriously questioning the long-held premise that humans are largely immune to the effects of artificial light at night.

Research is now confirming that artificial light - even in quite small doses - disrupts sleep, confuses circadian rhythms and impedes the production of the hormone melatonin.

All of which is bad news if the consequences of excessive exposure to light at night really do include an increased risk for obesity, diabetes, cancer and cardiovascular disease.

Back in 2012 the American Medical Association (AMA) called for more research into the risks and benefits of occupational and environmental exposure to artificial light at night and for the introduction of new lighting technologies at home and at work that minimise circadian disruption.

Technological advances such as LEDs (light-emitting diodes) have improved the potential for better targeted lighting - but for now they are often brighter and more intrusive than the old lights they are replacing.

Much of our modern light - whether from TVs, computer screens, smart phones and electronic gadgets or from outdoor lighting of one form or another - is also ‘blue’ rich and so proves even more disruptive to the 24 hour biological process that regulates the body's functions.

According to conference organiser Prof Martin Morgan-Taylor, of the School of Law, De Montfort University, Leicester, and a Legal Advisor to the UK Campaign for Dark Skies, the physiological effects caused by lighting may be similar to noise.

"Admittedly, there are comparatively few studies as yet on the problems caused by lighting, but lights can and do wake people up, just as does noise," he said.

"Moreover, with light it appears that the subject does not need to be fully awakened to suffer the same negative effects as someone who has been deprived of sleep altogether."

This means that people's health can even be adversely affected by ‘security’ floodlighting and, what the Chartered Institute of Environmental Health (CIEH) refers to as, ‘light briefly turning on and off' during the night.

Prof Morgan-Taylor stated the research concerning cancer risks does not restrict itself to lighting that wakes the subject because risk factors are akin to the levels of night-time light entering a bedroom.

Paul Marchant, of Leeds Metropolitan University, questioned the widely held perception of ‘improved’ (brighter) lighting is always beneficial in reducing road accidents and crime.

The generic objection to this - based on the premise that light equals protection and darkness represents danger - is that we need all this light for safety and security, he said.

Such common belief goes a long way to explain why many supermarkets, petrol station forecourts and car parks, as well as our own driveways and yards, are lit more than ten times as brightly as they were just 20 years ago.

"In fact, the issue of light at night and safety is rather more complex, and there is little compelling evidence to support widespread such mis-assumptions," he said.

"Ever-brighter lights can, for example, actually diminish security by casting glare that impedes vision and creates shadows where criminals can hide."

Emma Marrington, CPRE Dark Skies campaigner and author of ‘Shedding Light’, a survey of local authority lighting policies, said some local authorities are taking steps in the right direction.

She said the research had revealed no evidence to support the fear that adjusting or dimming street lights impacted on public safety.

"We urge councils to do more to control lighting in their areas and ensure that the right lighting is used only where and when it is needed."

"We're not advocating changes where they're not appropriate - but why shine bright lights on residential streets, quiet roads and open countryside throughout the night when they are not needed?"

The consistent theme emerging from ALAN 14 was that there are many different aspects to artificial light at night and the effects on our well-being, ecology and life in general are only just beginning to be understood.

We will, no doubt, continue to tinker with the natural world and all its variances, and the exponential growth of artificial light in our homes and across the planet shows now time of dimming yet.

In the meantime, conferences like ALAN will gradually produce evidence in an attempt to redress the balance.

And one day there may come a time of new enlightenment - when we release that at certain times of the day we need dark more than light.


The conference was hosted by Leicester De Montfort Law School, De Montfort University, and co-organised with the EU COST Action LoNNe (Loss of the Night Network) in association with the International Dark Sky Association. My thanks to Martin Morgan-Taylor and Katie Scott.

LED lighting's dark side

New LED street lighting being installed by councils throughout the country to save money and cut carbon emissions could mean more sleepless nights and ultimately be bad for our health.

A study by the Campaign for the Protection of Rural England (CPRE) says some eco-friendly low-energy LED (light emitting diode) street lighting creates unnecessary glare and might have serious effects on people’s well-being.

Light pollution expert Martin Morgan-Taylor has called for more research into which wavelengths, levels and durations of lighting pose health threats - and how this compares with modern lighting practices.

The lecturer - from Leicester’s De Montfort University - says medical research is increasingly linking LED lighting with more serious health issues such as cancer and depression.

"Artificial lighting is known to have negative effects on human health and well-being if sleep is disrupted by bright light shining into bedroom windows," he said.

"What we know is that ‘white’ or ‘blue-rich’ lighting - which mimics natural daylight - is being increasingly used at night.

"This type of light suppresses the production of a circadian rhythm hormone called melatonin, which is believed to be a powerful anti-oxidant that helps to ward off some cancers," he said.

The CPRE report, ‘Shedding Light – a survey of local authority approaches to lighting in England’ is the first piece of research to ask councils how they control light pollution.

Councils are urged to give ‘careful consideration’ to the type of LED lighting they use and weigh the potential impacts that higher temperature blue-rich lighting has on ecology and human health.

The report says authorities across England could be doing more to reduce the impact of light pollution and be saving hundreds of thousands of pounds a year in the process by using dimming schemes.

It also urges councils to preserve dark skies by having a ‘presumption against’ new lighting in existing dark areas and preventing ‘inappropriate and badly designed development’ that masks views of the night sky.

But according to the survey of 83 local authorities fewer than two thirds of councils in England are actively seeking to minimise the impact of bad lighting - despite recent changes to planning laws which encourage them to do so.

The CPRE also recommends new street lighting should be tested ‘in situ’ before schemes are rolled out across wider areas to ensure that it is the minimum required for the task and does not cause a nuisance to residents.

Street lighting in England costs councils around £616m a year and can account for up to 30% of their carbon emissions.

The CPRE study reveals that despite the number of people living with severe light pollution around the country growing more than a third of councils have no formal policy in place.

Almost half of councils responding said they were involved in dimming street lights in their areas and a third say they are now switching off street lights - typically between midnight and 5am.

The research found dimming schemes are significantly more popular with residents than switch off schemes - with 68 per cent of respondents saying local communities had been very supportive.

Some council schemes to replace old-style sodium ‘orange’ street lighting with new LED lamps have attracted criticism from nearby residents.

Last month people in a west London borough complained that new LED street lamps were so bright they were no longer getting a good night's sleep.

Hounslow council started using the lights as part of a multi-million pound improvement scheme but people living close to the new LED lighting described it is ‘like living on a floodlit soccer pitch’.

Elsewhere, Leicester city council is updating 32,000 of its 37,000 street lights as part of a commitment to reduce the council's carbon footprint by 50% before 2025.

The three year £13.9m project began in March 2013 and will contribute an estimated saving of 5,350 tonnes of carbon emissions per annum.

It includes a Central Management System (CMS) for remote control of lighting levels in specific areas, allowing dimmed lighting, for example, in the early hours before dawn.

The council says replacing its existing stock with LED lighting will reduce energy usage and carbon emissions by over 40% compared with current levels, saving electricity charges (at 2013 prices) of £0.84m a year.

Using a CMS should provide a further 17% reduction, increasing the overall savings to 57% of current energy usage and carbon emissions, and slashing a total of £1.2m off its annual electricity bill.


Aerial view of Leicester city centre at night clearly showing the streets
where new white LED lighting has already been installed.

Other councils are, however, taking a more cautious route. In Essex, the streets have been equipped with one of the world’s largest wireless street lighting control systems.

Around 125,000 of the county’s street lights have been wirelessly linked, allowing centralised control and fault detection.

The council expects to reduce the energy cost of street lighting by around £1.3 million per year and to cut annual carbon emissions by over 8,000 tons.

Earlier this year Trafford council in Manchester delayed its £9.3m scheme to replace all its 27,000 street lights after a resident threatened High Court action.

Simon Nicholas, a chartered engineer and businessman, raised concerns that new LED lighting had the potential to cause health problems.

"We're breaking new ground here and new evidence is emerging all the time," he said. "The council has not fully taken these studies into account."

Mr Nicholas claimed some councils are not looking at the bigger picture ."LEDs are currently on an exponential curve in terms of development," he said.

"In five years’ time we may well have really good LED street lights. Anyone charging in now is making a huge mistake."

Emma Marrington, CPRE Dark Skies campaigner and author of the ‘Shedding Light’ report, said: "Many local authorities are taking steps in the right direction but much more can be done.

"We urge councils to do more to control lighting in their areas and ensure that the right lighting is used only where and when it is needed."

She said the research had revealed no evidence to support the fear that adjusting or dimming street lights impacted on public safety.

"We're not advocating changes where they're not appropriate - but why shine bright lights on residential streets, quiet roads and open countryside throughout the night when it's not needed?

"Genuine dark starry nights are becoming harder and harder to find which is why councils should take action to control it now. Light pollution blurs the distinction between town and country, ruins the countryside's tranquil character and denies us the experience of a truly starry sky."

The Lighthouse Keeper is written by Clive Simpson - for more information, commission
enquiries or to re-publish any of his articles click here for contact information

You are what you sleep

Margaret Thatcher was once famous for promoting the adage that she could thrive and work effectively on only a few hours sleep per night.

And, though there are exceptions to every rule, for the large majority of us it is not the same - we ignore sleep at our peril.

A report today for the BBC's ‘Day of the Body Clock’ asserts that society has become ‘supremely arrogant’ in ignoring the importance of sleep.

Leading researchers from Oxford, Cambridge, Harvard, Manchester and Surrey universities have warned that cutting back on sleep is leading to serious health problems.

Scientists have warned that our modern life and 24 hour society mean many people are now ‘living against’ their body clocks with damaging consequences for health and well-being.

We all know that lack of regular sleep can affect our mood, vitality and energy levels. But cancer, heart disease, type-2 diabetes, infections and obesity have also all been linked to reduced sleep.

Prof Russell Foster, from the University of Oxford, told the BBC that people are now getting on average between one and two hours less sleep a night than 60 years ago.

"We are the supremely arrogant species because we feel we can ignore the fact that we have evolved under a light-dark cycle,” he said.

“What we do as a species, perhaps uniquely, is override the clock. And long-term acting against the clock can lead to serious health problems.”

Regular readers of ‘The Lighthouse Keeper’ will know that the natural rhythms of life, and of light and darkness, have been discussed at frequent intervals.

Harvard University’s Prof Charles Czeisler confirmed that light is the “most  powerful synchroniser” of our internal biological clocks.

He said energy efficient light bulbs as well as TVs, smart phones, tablets and computers had high levels of light in the blue end of the spectrum, which is "right in the sweet spot" for disrupting the body clock.

“Light exposure, especially short wavelength blue-ish light in the evening, will reset our circadian rhythms to a later hour, postponing the release of the sleep-promoting hormone melatonin and making it more difficult for us to get up in the morning.

“It’s a big concern that we're being exposed to much more light, sleeping less and, as a consequence, may suffer from many chronic diseases.”

In ‘Blinded by the night’ I noted that an increasing number of scientific studies were questioning the long-held premise that humans are largely immune to the effects of artificial light at night.

Today, or to be correct, tonight, we have levels of light hundreds and thousands of time higher than the natural level during the night – and light pollution is currently rising by a general average of 20 percent a year.

What is happening in the streets outside our homes is not always within our control. But we can take more personal responsibility when it comes to the light behind closed doors.

In his book ‘A Great Day at the Office’, Dr John Briffa discusses sleep as one of the strategies to help maximise our energy and performance levels.

“Light exposure in the day promotes better sleep but it may have the reserve effect late in the evening,” he says.

“In one study, light exposure from room lighting was found to delay meltonin exposure by about 90 minutes. Turning room lighting down, or perhaps off altogether (and using dimly lit lamps) during the evening may help sleep.”

I covered the topic of how excessive light at night affect our sleep and health more extensively in ‘Early morning birdsong’.

If you don’t sleep too well at night then it is probably a good idea, according to Dr Briffa, to be mindful of the potential impact of evening light levels on sleep.

TVs, laptops, tablets and smart phones - with their blue-rich light - can all suppress melatonin function too so avoiding the use of these within a couple of hours of bedtime may be a helpful - though impossibly hard - tactic to implement.


The Lighthouse Keeper is written by Clive Simpson - for more information, commission
enquiries or to re-publish any of his articles click here for contact information

Street lite

Photo: Clive Simpson

On the road home the night-time light has changed. We are in the heart of South Lincolnshire’s farming landscape approaching the interestingly named hamlet of Cowbit, midway along the old main road between Crowland and Spalding.

The road bends gently along a raised bank, originally built to stave off flooding from the plain of the nearby River Welland, and the lights cut through the night like harbour beacons around a vast concave seashore.

Tonight, I notice that the familiar curve of orange-glowing street lights - picking out the homeward route ahead against the flat Fenland horizon - have been replaced by the cool and dazzlingly bright light of modern LED technology.

Definitely cheaper to run - and therefore more energy efficient - these lights are an increasing part of our night-time scenery up and down the country.

But after five miles of driving along dark, unlit roads the clinical brilliance comes as a shock to night-adjusted eyes.

All this is part of local authority plans - in this case Lincolnshire County Council - to replace and update all our traditional street and road lighting over the coming years.

Energy and cost savings aside, the new kind of lighting is defined by its brightness and intensity, like spotlights on a West End stage show. But at least there is less apparent spillage into the heavens above.

LED luminance is potentially much more controllable than traditional sodium light and so one might reasonably ask the question of our lighting engineers - is it necessary (and even safe for approaching motorists) to have these beams on full luminance at the point where we suddenly cross from dark to light?

There are increasing complaints from across the country where such shiny new lights - installed in normal streets and cul-de-sacs - have cut through curtained windows to illuminate living and sleeping spaces, playing havoc for those in the vicinity.

Bright is not always best for human health and there is obviously a need for more research into the potential risks from the glare of LED lighting.

Already it is well documented that exposure to LED light suppresses melatonin production by up to five times more than exposure to sodium-based light, disrupting our biological clocks and affecting sleeping and rest periods.

Recent research in Spain has indicated that long-term exposure to LED street lighting could, as a result of the high levels of blue band radiation, cause irreparable harm to the retina of the human eye.

And last year a report by the French government stated that a luminance level higher than 10,000 cd/m2 causes visual discomfort whatever the position of the lighting unit in the field of vision.

As the emission surfaces of LEDs are highly-concentrated point sources the luminance of each individual source can be 1000 times higher than discomfort levels, making this intense glare a tangible problem.

Which brings me to reflect on the familiar orange, phosphorescent glow that has been part of our night time scene for so long.

Despite its intrusion, particularly into the night sky above, will we come to rue the day of its disappearance?

At the ending of DH Lawrence’s ‘Sons and Lovers’ the book’s central character Paul Morel is drawn ‘towards the city's gold phosphorescence’.

Signifying corruption and decay, ‘phosphorescence' was to become one of Lawrence’s jargon words in subsequent novels.

‘But no, he would not give in. Turning sharply, he walked towards the city's gold phosphorescence. His fists were shut, his mouth set fast. He would not take that direction, to the darkness... He walked towards the faintly humming, glowing town, quickly.’

For Paul Morel, the ending was something of a false epiphany. That 'gold phosphorescence' was an emanation of the mechanised life of the industrialised world - the glow of false promise.

In the end Paul’s tragedy was that he was only able to move in the direction of the city, humming not with the natural activity of a hive, but with machinery, and glowing not with sunshine and warmth but with the ghastly phosphorescence of street lamps and decay.

That familiar orange glow in our night-time skies does indeed represent something of the past, industrial age - whereas the clinical, white light of LEDs is symbolic of the modern, sanitised world.

Our continued attempts to tame and banish the natural darkness and rhythms of life only serve to deepen the shadows around us. What, I wonder, would Lawrence have made of this?

The Lighthouse Keeper is written by Clive Simpson - for more information, commission enquiries or to re-publish any of his articles click here for contact information

Early morning birdsong

Lighthouse on the cliff tops of Cromer, Norfolk.                                       Photo: Clive Simpson

Are you sleeping well on these long end of winter nights? If not then part of the answer may be in how dark your bedroom is.

As we travel through winter, with its emerging hint of longer days and promise of spring, it is appropriate to revisit the theme of some previous blog articles about night, darkness and the effect of artificial light on our modern lives.

The other morning I awoke midway through the night at around 3 am to hear birdsong outside. Normally a welcoming sound but at that hour, and with dawn still some four hours away, a little disconcerting. 

Birds singing during the ‘night’ is no longer such an infrequent occurrence. It is a somewhat troubling development and perhaps an indicator of wider factors at play. 

The birds it seems are often duped by our brightly lit streets, on-off ‘security’ lights and other forms of night-time illumination and general light pollution, into thinking daylight has arrived early.

And here’s the thing. All of us, birds included, are hard-wired to sleep in darkness, not in bedrooms full of light, computer monitors, digital alarm clocks or TV stand-by lights.

Chronic exposure to light at night is bad and, to understand why, we need to look into the past. Prior to the end of the Stone Age, humans were largely exposed to just two different kinds of natural light.

During the day we had the sun, while at night we had the moon and the stars, and perhaps the light from campfires. The binary day/night pattern was unrelenting, and our biological programming followed suit.

So why can't you get a good night's sleep? The problem is that many of us probably don't realise what makes us fall asleep in the first place. 

Compared to our ancestors our bodies’ circadian rhythms now also have artificial lighting at night (LAN) to contend with. Indoor lighting may be considerably less powerful than sunlight but it is certainly many orders of magnitude greater than star and moonlight. 

Melatonin suppression is key to understanding much of why LAN is bad for us, particularly in the winter months of the northern hemisphere.

This workhorse biochemical is produced at night when it is dark by the brain's pineal gland  to regulate our sleep-wake cycle. It lowers blood pressure, glucose levels and body temperature — key physiological responses responsible for restful sleep. 

The part of our brain that controls the body’s biological clock is known as the Suprachiasmatic Nucleus (SCN), a group of cells in the hypothalamus which respond to light and dark signals. 

The optic nerves in our eyes sense light and transmit signals to the SCN telling the brain when it is time to wake up, which also kickstarts other processes, like raising body temperature and producing hormones such as cortisol. 

Normally our cortisol levels are relatively low at night - allowing us to sleep - and higher during the day, allowing for the stabilisation of energy levels and the modulation of immune function. 

But LAN unnaturally elevates cortisol levels at night, which can then disrupt sleep and introduce a host of problems relating things like body-fat levels and insulin resistance. It also contributes to sleep debt and can disrupt the regulation of appetite.

If, on the other hand, our rooms are properly dark at night there is no optic signal to the SCN, so our bodies pump out the much needed melatonin. 

Light exposure during the previous day can also affect melatonin levels - studies have shown that exposure to bright room light before bedtime shortens melatonin duration by about 90 minutes compared to dim light exposure. In addition, exposure to room light during usual hours of sleep suppresses melatonin levels by more than 50 percent. 

So, even before you hit the hay, the light in your bedroom may be causing you problems. With the introduction of tablets (not the sleeping kind), smartphones, and energy-efficient LED light bulbs, it's an issue that's only getting worse. 

And just to add insult to injury, many modern LED (light-emitting diode) devices emit blue light which is especially good at suppressing melatonin. This is because melanopsin — a photo-pigment found in specialised cells of the retina involved in the regulation of circadian rhythms — is most sensitive to blue light. 

Regrettably, all this hormone and biochemical disruption is creating downstream effects — and studies are now showing correlations with weight gain problems, the incidence of cancer, depression and adverse effects on the immune system.

Essentially we need to keep our bedrooms as dark as possible and avoid blue light before sleep. 

You might want to think about this next time you leave even the dimmest lights on in your bedroom overnight — including your clock radio and the light that bleeds in through the curtains from nearby street lights. 

Why not try removing electronic equipment from the bedroom and using dimmer lights before before you turn in, as well as refraining from viewing TV, smartphones and computer screens for up to an hour before bed?

And if your bedroom is affected by artificial light from outside (and blackout curtains don’t do the trick) speak to your local council about street light shielding, and maybe your neighbour about realigning any problematic external floodlights.

Oh, and while we’re at it, switch off that bl**dy lighthouse! Sleep well, zzz zzz.

The Lighthouse Keeper is written by Clive Simpson - for more information or to get in touch click here

The End of Night

The bright lights of Europe spilling into the night as seen from the Space Station.

Night is no longer as dark as it used to be. Street lamps, neon signs, ‘security' lights and the rest all contribute to an ever-present glow that has transformed the natural world and turned modern life into a wash of artificial light.

It is a theme the Lighthouse Keeper has looked at in several blog essays this autumn, partly inspired by one of this summer's best-selling books ‘The End of Night', written by US-based journalist Paul Bogard.

Light pollution around the world has expanded exponentially in recent decades and now it is reckoned that the vast majority people across Western Europe and the United States no longer experience a truly dark night.

Night's natural darkness is invaluable for our spiritual health and the health of the natural world and as a consequence every living creature, including ourselves, suffers from its loss.

Like the advancement of technology it is one of those things that changes subtly against the backdrop of busy lives – and almost without noticing we become accustomed to a new ‘normal'.
 

The Bortle scale, which classifies the darkness of skies from point of view of an astronomer, 
was originally published in Sky & Telescope magazine in 2001 and is an apt illustration for Bogard’s theme.

 
In his book, Bogard investigates the meaning of darkness and travels to some of the world's intensely lit cities - from Paris, the ‘city of light' to glittering Las Vegas and to still gas-lit streets of London's Westminster district, meeting an inimitable range of characters along the way.

Bogard contrasts the skies above our cities and urban populations to some of the most remote and darkest places on the globe, like the great national parks in America and the Island of Sark off the British coast.

He discusses how light is negatively affecting the natural world, how our well-being is significantly influenced by darkness or its lack, and how it's not a matter of using light at night or not, but rather when and where, how and how much.

Travelling the world looking for dark skies, Bogard considers our affinity for artificial light, the false sense of security it provides, and its implications.

He covers such broadly diverse issues as the health impacts of working the night-shift to the persecution of bats, and urges the reader to weigh the ramifications of light pollution and our failure to address them.  

The growth of light piollution across the United States, including
a projection for the year 2025.

 
"We think that because of television, the internet, or jet travel we see a lot of the planet," says Bogard.

"But the only chance we really have to retain our sense of the scale in the real universe is by looking at the night sky."

As we approach the winter solstice when the dark nights of the northern hemisphere reach their longest, what better time to delve into such a book?

Bogard's evocation of the night blends environmental and cultural history to make reading about light pollution a surprising pleasure.

By reclaiming the night we stand only to gain. Not least in decreased energy costs and redressing the balance of life but also in that other fast-disappearing phenomenon - wonder.

Bogard draws attention to the naturally dark night as a landscape in its own right - a separate, incredibly valuable environment that we overlook and destroy at our own peril.

‘The End of Night’ by Paul Bogard
is published by Fourth Estate and
is available at your local bookshop
or from Amazon.

The Age of Miracles

Karen Walker-Thompson's novel ‘The Age of Miracles’ is not an obvious literary award winner though it is a compulsive read and contains a number of interesting themes and challenging ideas - all introduced as the result of the phenomenon of Earth’s rotation slowing.

My previous blog ‘How fragile we are’ looked at the novel’s apocalyptic catastrophe theme - the dire consequences to all life on Earth as a result of the planet’s rotation gradually slowing and therefore extending both day and night.

But there are more subtle implications also to be considered when looking at the effects exaggerated daylight and dark hours might have on the normal working of our own bodies.

Midway through the book at the beginning of chapter 17, Thompson-Walker writes: "Two thousand years of art and superstition would suggest that it is darkness that haunts us most... but dozens of experiments conducted in the aftermath of the slowing revealed that it was not darkness that tampered most with our moods - it was light."

The implication, though not the cause, of night turning into day is not a million miles from the theme adopted by The Lighthouse Keeper for two of this autumn’s blog essays - ‘Fear of the dark’ and ‘Blinded by the night’.

It is now well-established by the medical profession that working through the night and the influence of light after dark can affect our circadian rhythms and long-term health and well-being in significant ways.

In his 2012 paper ‘Light Pollution, Nuisance and Planning Laws in the UK’ Martin Morgan-Taylor, principal lecturer in law at Leicester’s De Montfort University, states that artificial lighting is known to cause "some fairly obvious negative effects on human health and well-being" - in as much as floodlighting or illuminated advertising hoardings may disturb sleep by shining in bedroom windows.

"Indeed, it may be thought that sleeplessness may cause only temporary or negligible problems, but medical research is increasingly linking artificial light at night with some serious health effects, such as cancer and depression," he says.

"Other research indicates that artificial light at night may general disrupt human circadian rhythms."

In addressing the question of why this might by the case, Prof Morgan-Taylor pins the likely cause on what is known is that ‘white’ or ‘blue rich’ lighting, which mimics natural daylight and is being increasingly used at night.

"This type of light particularly suppresses the production of a circadian rhythm hormone called Melotin, so disturbing circadian rhythms," he states. Melotin is believed to be a powerful anti-oxidant that helps to ward off some human cancers.

"In other words, an avoidable exposure to ‘white/blue rich’ light at night may increase a person’s susceptibility to some cancers - and we are increasing our use of this form of lighting at night," he adds.

In ‘The Age of Miracles’ the world at large is thrust into ever-lengthening days and nights as Earth slows gradually from its standard 24 hour rotation.

At first the consequences are manageable, more of an inconvenience, but as the daylight hours stretch into periods of 30 and then 40 hours, and likewise the night, the effects on daily life become ever more pronounced and difficult. 

The terminator dividing day from night across Earth as seen
from the International Space Station.

The novel takes the concept of our bodies adapting to unnatural light patterns to a whole new level - but in considering current light pollution levels across the developed world (in England it increased by 24 percent between 1993 and 2000) the extrapolation is valuable.

The first chapter of Genesis in the Bible states that God ‘divided the light from the darkness’, which in Biblical terms can be viewed as both symbolic as well as being a statement about the natural environment. In essence we need them both because light allows us to see and darkness gives us an opportunity to sleep.

By lighting our neighbourhoods, towns and cities to excess and flooding our yards with unnecessary light we are wasting energy and undoubttedly contributing to climate change. In a more subtle way we may also be tampering with the laws of nature - and perhaps even creation itself. 

Blinded by the night

Winter sunset over the Solent from Portsdown Hill - Clive Simpson

It is hardly surprising to learn that in our modern, consumer-driven culture we are using far more light during the hours of darkness than we actually need.

But what is not generally recognised in our liberal use of illumination is the mounting cost to both the environment and ourselves.

An increasing number of scientific studies are questioning the long-held premise that humans are largely immune to the effects of artificial light at night.

And our own eyes, if only we opened them long enough in a metaphorical sense to see the bigger picture, would surely agree.

Research indicates that artificial nocturnal light - even in quite small doses - disrupts sleep, confuses circadian rhythms and impedes the production of the hormone melatonin.

All of which is bad news if the consequences of excessive exposure to light at night really do include an increased risk for obesity, diabetes and cardiovascular disease.

Technological advances such as LEDs (light-emitting diodes) have certainly improved the potential for better targeted lighting - but they are often brighter and more intrusive than the old lights they are replacing.

And much more of this modern light - whether from TVs, computer screens and electronic gadgets or from outdoor lighting of one form or another - is rich with blue wavelengths and most disruptive to the 24 hour biological process that regulates the body's functions.

In effect, blue light sends subtle messages to our brain that night is over – or in a basic, primal way that morning's blue sky has returned and that the day has begun - quite the opposite signal we need in the middle of the night.

Two years ago the American Medical Association (AMA) called for increased research into the risks and benefits of occupational and environmental exposure to artificial light at night and for the introduction of new lighting technologies at home and at work that minimise circadian disruption.

According to Prof Martin Morgan Taylor, of the School of Law, De Montfort University, Leicester, and a Legal Advisor (Lighting) to the UK Campaign for Dark Skies, the physiological effects caused by lighting may be similar to noise.

In his paper ‘Light Pollution and Nuisance: The Enforcement Guidance for Light as a Statutory Nuisance' he says: "Admittedly, there are comparatively few studies as yet on the problems caused by lighting, but lights can and do wake people up, as does noise.

"Moreover, with noise it appears that the subject does not need to be fully awakened to suffer the same negative effects as someone who has been deprived of sleep altogether."

As a result, people's health could be adversely affected by the floodlighting and what the Chartered Institute of Environmental Health (CIEH) refers to as ‘light briefly turning on and off' during the night.

Prof Morgan Taylor states the research concerning cancer risks does not restrict itself to lighting that wakes the subject but the risk factor is akin to the level of night-time light entering the bedroom.

"The glare from overly bright lighting can also cause further problems, for although the iris may contract to cut down the amount of light entering the eye, the scale of the glare from floodlighting can cause momentary blindness and pain," he says. "This is particularly an issue for the elderly, as the muscles controlling the iris do tend to become less efficient with age."

On a personal level, while we seldom leave our interior lights bare, most of our outdoor lighting remains unshielded – indiscriminately sending light straight into the sky, into our eyes, and into our neighbours' bedrooms.

The relatively simple act of adjusting or shielding outdoor lights by installing or retrofitting lamp fixtures that direct light downward to its intended target represents our best chance to control light pollution.

The generic objection to this - based on the premise that light equals protection and darkness represents danger - is that we need all this light for safety and security.

This common belief goes a long way to explain why many supermarkets, petrol station forecourts and car parks as well as our own driveways and yards are lit more than ten times as brightly as they were just 20 years ago.

In fact, the issue of light at night and safety is rather more complex, with little compelling evidence to support widespread assumptions.

For example, ever-brighter lights can actually diminish security by casting glare that impedes vision and creates shadows where criminals can hide.

The ‘World Atlas of the Artificial Night Sky Brightness', a series of computer-generated maps from satellite data that depict the extent of light pollution across the globe, were created by Italian astronomer Fabio Falchi and illustrate the point nicely.

Today, or to be correct, tonight, we have levels of light hundreds and thousands of times higher than the natural night time level – and light pollution is currently rising by an average of 20 per cent a year.

So this evening, before you flood the yard or your front drive with brilliant light, consider for a moment the opposite side of the day. Would we tolerate, with the same kind of indifference, attempts to modify the daytime by lowering light levels a hundred or a thousand times?

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If you enjoyed this Lighthouse Keeper essay by Clive Simpson looking at the impact of artificial light at night in our modern world please recommend or Tweet the link - Blinded by the night. The title is derived from ‘Blinded by the Light', a song written and originally recorded by Bruce Springsteen and widely known through the 1976 chart-topping version recorded by Manfred Mann's Earth Band.

Fear of the dark

Even lighthouse keepers - at one time true custodians of light - are an endangered species these days, their solitary and lonesome existence largely replaced by automated and computer-controlled systems.

But just as technology has seemingly usurped most aspects of human endeavour and experience - including the once dark night-time skies in the heavens above - the UK’s cross channel neighbour has, as it were, ‘seen the light’. Vive la France!

At the end of August, as its populous was returning to work after ‘les grandes vacances’, the whole country grew darker through the night as one of the world’s most comprehensive lighting ordinances came into effect.

Now, in the early hours of every morning between 1 am and 7 am, shop lights are being turned off and lights inside office buildings must be extinguished within an hour of workers leaving the premises.

Lighting on France’s building facades cannot be turned on before sunset and, over the next two years, new regulations restricting lighting on advertising hoardings will also take effect.

These rules are designed to eventually cut carbon dioxide emissions by 250,000 tons per year, saving the equivalent of the annual energy consumption of 750,000 households and slashing the country’s overall energy bill by 200 million Euros a year.

But, according to France’s Environment Ministry, no less a motivation is to ‘reduce the footprint of artificial lighting on the nocturnal environment’.

This is a powerful acknowledgement that excessive use of lighting is not only consuming too much energy but is endangering our health and the health of the ecosystems on which we rely.

Researchers are now focusing on the impacts of so-called ecological light pollution and warn that disrupting the natural patterns of light and dark - and thus the structures and functions of ecosystems - is having a profound impact far beyond what we realise.

It’s a global problem and is worsening by the month as countries like China, India and Brazil become increasingly affluent and urbanised.

Views of Earth at night show vast areas of North America, Europe, the Middle East, and Asia glowing with light. Only the world’s remotest regions - Siberia, the Tibetan plateau, the Sahara Desert, the Amazon, and the Australian outback remain cloaked in darkness.

Some countries, including the UK, have enacted limited regulations to reduce light pollution but in reality most nations and cities still do little to manage our excessive, almost compulsive, use of light.

The photographs below show the UK and London at night as seen by astronauts on the International Space Station (ISS). It serves as a poignant illustration of the point in question - namely that as both individuals and nations we are using far too much artificial light with little or no consideration for either cost, the environment or our own health.

As the autumn nights draw in, this is the first in a series of short Lighthouse Keeper essays looking at the impact of artificial light at night in our modern world. The title draws from Gordon Giltrap’s classic 1978 album ‘Fear of the Dark’ which was re-released in 2013 and is newly remastered from the original tapes, including eight extra tracks drawn from a series of singles released between 1978 and 1980. ‘Fear of the Dark’ , a Lighthouse Keeper 'top ten' album, saw Giltrap backed by a band of outstanding musicians: John G Perry (Bass), Rod Edwards (keyboards) and Simon Phillips (drums) and featured many outstanding tracks. 

For more articles in this series search under 'artificial light' on the adjacent tag cloud.

Beauty of the night

DUSK is about to wrap itself around the penultimate day of August - a balmy evening following a warm and sunny day on the prairies of South Lincolnshire.

As the evening quietens there is the distant drone of combine harvesters, working flat out just as they have been all day long in fields of wheat and barley, creating a dusty plume and the sweet, husky smell of freshly mown sheafs.

It’s barely 8.30 pm, twilight is fading fast and the local birds embark on a last cacophony of celebratory singing and chirruping before acquiescing to the night.

By now, the garden is alive with insects of the dark, a myriad moths flitting amongst the fading lavender heads and the bright open yellow blooms of evening primrose.

The warm air is rich with heady scents, a toxic mix for our undersung flying heroes of this hour who thrive and live their short lives by the smells of late summer evenings and early autumn nights.

Apart from this transitional time of the year when we might still find occasion to wander through our garden or local park as dusk falls, we tend to largely ignore these night-time creatures - perhaps we fear them, or just prefer to squish them without so much as a second thought.

No one knows exactly but there could be 250,000 different species of moth worldwide, so no matter where we live they inevitably share our space.

Their existence, a somewhat peculiar affair when compared to higher forms, is nevertheless an integral and important part of our natural eco system.

A moth emerges from its cocoon in leaf litter, then mates and lays eggs within the first 48 hours of life. With no more eating or drinking for the rest of its life, existence takes on a self-less and higher calling - pollinating flowers and crops, and maybe becoming a tasty snack for those further up the food chain.

Though an individual may live just a week or two - and the loss of a tiny percentage may have serious implications for some forms of agriculture - collectively they pollinate some 80 percent of the world’s flora.

Its largely nocturnal habit, however, means they are largely un-noticed by ourselves, except perhaps because of their fatal attraction to our ever-spreading arrays of artificial lights in backyards, streets and driveways.

Blinded by that same light, we all too often miss the delicate beauty of these nocturnal butterflies. Like bees, the humble moth does much to keep our world alive.

 

Let there be light

The Milky Way strode across the sky, a band of faint light spanning almost from horizon to horizon. In the distance, lights sparkled like ships on a dark ocean. Such a dark sky with a myriad twinkling stars is a sight that is becoming all too rare - or even beyond the experience of many.

This is the heart of the Fens at night. A natural planetarium with glorious low horizons in every direction and a pitch dark sky, just far enough from the sodium city lights of Peterborough and the market towns of Stamford and Spalding.

Indeed, this part of South Lincolnshire, an industrial farming and food-producing landscape by day, is by night one of Britain’s dwindling exceptions to our light-polluted lives.

According to the Council for the Protection of Rural England (CPRE), places with the ‘purest’ night-time darkness are (perhaps by definition) among the least populated in the country.

Dartmoor, Exmoor and the Quantock Hills in the south west; Salisbury Plain and the top of the Chilterns in southern England; parts of Lincolnshire to the east; the Black Mountains and the Brecons in Wales; the Yorkshire moors and some of Northumberland; plus large swathes of Scotland, outside major cities and the Borders.

Early this year Sark – the smallest of the four Channel Islands at just a couple of square miles – became the world's first officially-designated ‘Dark Sky Island’.

The US-based International Dark-Sky Association measured Sark's night-time illumination levels and assessed the degree of visibility of constellations in the night sky. And to assist Sark's claim, one of its government officers visited every outside light on the island and recommended measures to cut artificial light seeping into the sky.

Sark is not Britain's only dark success. In 2009 Galloway Forest in Scotland was designated Europe's first ‘Dark Sky Park’. As a result visitor numbers are booming, a new observatory is planned for the edge of the forest and neighbouring local councils have introduced restrictions on outside lighting to preserve the quality of darkness.

The Inner Hebrides’ island of Coll, 13 miles long and three miles wide with two main roads and a small airport, is another dark spot with no security lights on homes, or traffic or street lights.

Much closer to home, the Rutland village of Market Overton recently reduced its light pollution by replacing its old sodium street lights with modern light-emitting diode lamps. Its 39 lamps cost over £20,000 in total to convert but immediately produced an 80 per cent saving in electricity.

These locations, however, remain the exceptions to the light-polluted rule. And they are getting rarer thanks to what the Campaign for Dark Skies describes as ‘wasteful’ over-provision of domestic lighting by British householders.

CPRE has, for several years, urged government action to limit light pollution from street lamps, overnight illumination of shopping centres, office blocks and public buildings, stark upward lighting from floodlit sports complexes and, at the household level, outdoor lights that are unnecessarily bright or disperse their illumination. Of course it would also save a lot of money and energy too – Britain's street lamps alone cost an estimated £500 million a year to run.

The most common forms of such pollution are ‘light trespass’ when illumination from Britain's 22 million homes and 7.5 million street lights, even if designed with the intention of shining downwards, typically also extends upwards. You can see it in this picture of the UK at night as seen by astronauts passing overhead aboard the International Space Station.

Two other common forms are ‘sky glow’ – that orange glow visible for tens of miles around towns and cities easily seen from the air or from distant roads – and ‘glare’, the harsh white light on some modern housing estates and golf driving ranges at night.

As October marches onwards, here in the northern hemisphere we are plunging headlong into days of less daylight, longer nights and the clocks going back – all marking the onset of winter. And, while we say we prefer it lighter for longer, in reality most of us only now experience a limited degree of darkness.

Modern electricity's triumph over the night keeps us all busier. We live in a fast-moving, fully lit world where night still happens but is more of an optional experience – a kind of failed daylight. Our 24/7 supermarket culture has done it’s best to phase out the night.

Yet slowness and silence – the different rhythm of the night – are a necessary correction to the day. Life is too short to be all daylight. Moments of life take on a different quality at night-time, where the moon reflects the light of the sun and we have time to reflect what life is to us. So why not turn down the lights and rest awhile? Night is not less – it's more.

 

The Lighthouse Keeper is written by Clive Simpson - for more information, commission enquiries or to re-publish any of his articles click here for contact details

Pictures from above

As a keen photographer the Lighthouse Keeper is always looking for a new angle or perspective on a familiar subject - but from an earthly vantage point even perched atop of a high crane is no match for the kind of views astronauts have from the orbiting International Space Station.

This night time view of India-Pakistan borderlands was one of a series of night-time shots captured recently by one of the six crew members, who often say that one of their favourite off-duty pastimes is gazing back at Earth as there is "always something spectacular to see".

Clusters of yellow lights on the Indo-Gangetic Plain of northern India and northern Pakistan reveal numerous cities both large and small.

Of the hundreds of clusters, the largest are the metropolitan areas associated with the capital cities of Islamabad, Pakistan, in the foreground and New Delhi, India, at the top. For scale these metropolitan areas are approximately 700 km apart.

The lines of major highways connecting the larger cities also stand out. More subtle but still visible at night are the general outlines of the towering and partly cloud-covered Himalayan ranges immediately to the north (left).

A striking feature of this photograph is the line of lights, with a distinctly more orange hue, snaking across the central part of the image.

It appears to be more continuous and brighter than most highways in the view and is actually the fenced and floodlit border zone between the countries of India and Pakistan. The fence is designed to discourage smuggling and arms trafficking between the two countries.

This image was taken on a digital SLR camera with a 16 mm lens to provide a wide field of view, as the Space Station was tracking towards the southeast across the subcontinent of India.

The distinct, bright zone above the horizon (visible at top) is produced by airglow, a phenomena caused by excitation of atoms and molecules high in the atmosphere (above 80 km altitude) by ultraviolet radiation from the Sun. Part of the ISS and a solar panel array are visible at right.

This photograph below, taken from the Space Station at the end of July 2011, shows the Moon with the limb of Earth near the bottom, transitioning into the orange-coloured troposphere, the lowest and most dense portion of Earth's atmosphere.

The troposphere ends abruptly at the tropopause, which appears in the image as the sharp boundary between the orange and blue-coloured atmosphere. The silvery-blue noctilucent clouds extend far above the Earth's troposphere.