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

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.

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