5 ways you can reduce light pollution
This form of pollution contributes to carbon emissions and interferes with animal migration. Take these simple steps to reduce it.
By Chris BaskindFri, Mar 19 2010 at 8:13 AM EST
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Photo: timo_w2s/Flickr 
Darkness is as essential to our biological welfare, to our internal clockwork, as light itself. —Verlyn Klinkenborg, Our Vanishing Night
If — like most people — you live in a city, it's unlikely you can see the gossamer expanse of the Milky Way. It's possible you've never spotted it at all. For most urbanites, the nighttime sky is a pink glow broken only by the moon, the brightest stars and passing airplanes.
This is the form of pollution most people have forgotten: light pollution. And while undark skies may not rank in importance alongside the chemical trash we routinely dump into the atmosphere, the continuous, unblinking glare of modern life is not without its impact on wildlife, dwindling energy resources and human health.
What's the big deal about light pollution?
Light pollution is so widespread, so universal, so common to urban life that we hardly give it a thought. Set poetry aside for the moment — the great severing of our ancient connection to the constellations as they wheel gently through night and season. We are still confronted with four specific areas of concern regarding light pollution:
• Light pollution interferes with wildlife migratory and breeding patterns
• Unnecessary outdoor lighting wastes energy and contributes to greenhouse gas emissions
• Glare from bad lighting leads to unsafe driving conditions, particularly for older motorists
• Constant exposure to artificial lighting may interfere with human metabolism and sleep
These problems are sufficiently severe that the American Medical Association voted unanimously to support efforts to control light pollution. The U.S. Congress is expected to take up the issue of light pollution in hearings scheduled for July 13 and 14, 2009.
Here's how you can help curb light pollution
1) Start with the light switch. The cheapest, most obvious and most effective way to reduce light pollution is to start turning things off. While there's a time and place for outdoor lighting — illuminating after dark activities, for instance — many of us burn porch and spot lighting because it gives us a sense of security. In fact, there's little data to support the idea that outdoor lighting reduces crime. Turn on lights when you need them, or use portable lighting. Go dark when you don't.
2) Check with your power company to see if you're paying for outdoor lighting. It's possible you're being billed for that nasty sodium vapor lamp down at the street. Many utilities charge $5 to $10 a month for this service. A quick check of your bill or a call to Customer Service will tell the story. If this turns out to be the case, terminate the charge and ask that the light be removed. Most power companies are happy to oblige.
3) Consider replacing outdoor lights with intelligently designed, low-glare fixtures. Did you know there is a certification body for sky-friendly outdoor lighting? The International Dark-Sky Association evaluates fixtures for low glare and efficiency. Look for the IDA seal of approval on locally sourced fixtures, or seek out a company such as Starry Night Lights, which specializes in low-pollution lighting. They also maintain a blog on light pollution and related issues.
4) Place motion sensors on essential outdoor lamps. Lighting on demand trumps a manual switch or timer. Motion sensitive switches will light up porches and walkways when you need to move around after dark. They'll pay for themselves in fairly short order.
5) Replace conventional high-energy bulbs with efficient outdoor CFLs and LED floodlights. While efficiency lighting won't directly keep all those stray lumens from bouncing around, it will take some of the sting out of your monthly bill and reduce power company carbon emissions. Just don't fall into the trap of thinking that CFLs and LEDs are a green light to be sloppy about switching things off. While you're at it, see whether low-wattage, solar powered walkway lamps might replace area lighting. They're inexpensive and practically free to operate.
Now — enjoy the darkness!
You'll be surprised how much squelching a few bulbs around your home improves the view. Why not take this opportunity to get reacquainted with the nighttime sky? You don't need a telescope to see the major constellations, bright nebulas, open clusters, many of the planets, comets, meteors and dozens of man-made satellites and spacecraft.
It's not difficult to learn the ropes. If you're feeling old school, buy a simple star wheel. For easy pointers on nightly backyard observation highlights, try Sky and Telescope's The Week's Sky at a Glance. To spot orbital objects, such as the International Space Station, the Hubble Space Telescope, and a galaxy of satellites and discarded rocket boosters, create an account at Heavens Above (be sure to customize it for your location). And you can use your computer as a virtual planetarium with Stellarium, a free and full-featured 3D program that runs on Mac, Windows and Linux.
A set of inexpensive binoculars will expand your star-spotting capability. But all you really need is the desire to look up into the wonder of the night — and the blessings of a dark sky.
Selected light pollution resources:
The International Dark-Sky Association
Starry Night Lights’ Dark Sky blog
Wikipedia: Light Pollution
Starry Night Lights’ Dark Sky blog
Wikipedia: Light Pollution
Copyright Lighter Footstep 2009
Also on MNN:
MNN homepage photo: paul (dex) busy @ work/Flickr
Comments
Graham Cliff
07/11/2010 18:26 PM
Because light at night sucks insects to their deaths like a vacuum cleaner, insectivores die from starvation. You can learn more about the "hidden" harm done by unnecessary light at light in the CfDS handbook "Blinded by the Light?" -
http://www.britastro.org/dark-skies/handbook.html
The "hidden" harm has been done since before 1897 and no one has cared and no one cares even today. We really will be just too late,.... More
Judy Scott
05/03/2010 00:18 AM
Enter your commentsI wanted to comment on the importance of lighting quality as it relates to our children and adults. I believe we should strive for more efficient lighting solutions in schools but I do also have a concern that mandating changes too fast and the hype that surrounds this issue may result in the wrong implementation of lighting solutions and in sacrifices in light quality that I believe is so important to our well being. It takes time for new technologies to mature and to be.... More
Brington Early
04/03/2010 04:24 AM
Has anyone found any out-door flood lights power by solar panels that are worth the purchase? I've seen quite a few that cost well over $750 for the whole kit and can't find any reviews about them.
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