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I recently spent a couple weeks on the Big Island of Hawaii. Upon my arrival I noticed that all of the street lights, and most outside lights in general emitted a yellowish light. After a bit of research I learned that these were low pressure sodium fixtures. Hawaii county has a strict lighting code, and it all revolves around astonomy. Ive linked a couple of articles that shed some light on the subject. Kinda interesting
http://bigislandnow.com/2012/08/28/shift-to-high-tech-streetlights-saves-dark-skies-money/
http://www.cfht.hawaii.edu/ObsInfo/IslandLights/ordinance.html
http://bigislandnow.com/2012/08/28/shift-to-high-tech-streetlights-saves-dark-skies-money/
http://www.cfht.hawaii.edu/ObsInfo/IslandLights/ordinance.html