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How To Reduce Light Pollution From Your Home
What Is Light Pollution?
Learn what light pollution is so that you can help eliminate it. Light pollution refers to light that is cast up into the night sky needlessly by unshielded fixtures and lights that are left on unnecessarily. As you can see in the image above, taken from space at night, vast areas of the United States no longer have dark skies. Residents in much of the nation can no longer see the stars and other celestial objects clearly.
Note how bright the U.S. is compared to Northern
Canada, where the night sky is still dark and unpolluted from wasted light.
What Fixtures Reduce Light Pollution?
In New Mexico, home to many observatories and
amateur astronomers, Governor Bill Richardson signed a state law requiring all
outdoor fixtures to feature such shields. If you notice that your street lamps
do not feature such guards, contact you public works department and request that
they be installed.
To help prevent light pollution, replace it with
approved fixtures and don't leave lights on at night. Instead use a motion
sensor for security lighting and set it on the minimum run time setting needed.
Close your drapes at night as well.
Reduce Light Pollution From Street Lights
Even shielded high pressure sodium lights create
some light pollution as it is reflected off the ground and from objects.
To learn more about light pollution you might want to get a copy of the book "Let There Be Light, A Testimony on Behalf Of The Dark."