[Chaos-l] Light pollution reduction opportunity: New lighting in Raleigh
jstewart at misg.com
Wed Feb 14 15:01:51 EST 2007
Hi all. Terry made some good points, then asked:
> BTW, what is "full cutoff?"
A full cutoff fixture is one which emits no light above horizontal, i.e.
Good Lighting. For reference, you can visit:
http://www.iesna.org/PDF/FullCutoffLighting.pdf for the legal definition
and diagrams, or http://www.darksky.org/images/slide-set-d.html for IDA
slide sets showing why full cutoff lighting is preferred, and several
examples of fixtures.
Hope that helps.
Jon Stewart-Taylor: joncst at earthlink.net; 919-967-2912
Chapel Hill Astronomy: http://rtpnet.org/chaos/
Light pollution information: http://www.ncdarksky.org/
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