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More of a non-technical question, do you see demand for outdoor lights at the red end of the spectrum? Supposedly that's better for night vision, light polluti
by Pheide1j 8y ago
More of a non-technical question, do you see demand for outdoor lights at the red end of the spectrum?
Supposedly that's better for night vision, light pollution and various animals. But everywhere I go I see yellowish sodium vapor lights replaced with white LEDs.
- phasetransition 8y agoWe've certainly been asked about amber LEDs for coastal environment projects, so I think there is some demand. Amber LED performance, on the other hand, is a different story. The lumens out of a legacy high pressure sodium lamp are very high. It is still an engineering challenge to get comparable lumens out of LEDs at price point the market will bear.
- darkmighty 8y agoI think it's a shame sodium vapor lamps are being replaced. Low pressure sodium (LPS) is actually highly efficient, provide a very soothing color for nighttime, and for me most importantly are easily filtered by astronomical observations (their spectrum is nearly a single line). Their size and unwieldiness is justified in utility street lightning setting. http://adsbit.harvard.edu/cgi-bin/nph-iarticle_query?2001IAUS..196...81L&defaultprint=YES&filetype=.pdf http://adsbit.harvard.edu/cgi-bin/nph-iarticle_query?2001IAU...