Quote:
Originally Posted by Dylrob
Well I'm not familiar with the street lights on your side of the pond, but almost all of the ones in America are already the downward facing style:
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That sort of light is part of the problem. Yes, it faces down, but it also shines sideways and up. Note that the light emitting part shows below the supporting arm. This means that some of the light can go into the sky. It doesn't need to shine straight up to be a problem. Any light going above the horizon is the problem.
http://www.britastro.org/dark-skies/