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Now that we know why street lights are orange, let’s look at whether or not they should still be so. The answer isn’t as straightforward as it might seem. Although newer technology seems to surpass HPS in nearly all respects, there are still considerations to be made.

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Sources (lot’s of great ones!):
Lighting Research Center study comparing induction and metal halide sources to HPS:
http://www.lrc.rpi.edu/researchAreas/...

US Department of Energy’s information on blue light sources in street lighting:
https://www.energy.gov/sites/prod/fil...

University of Pittsburgh’s environmental assessment of LEDs (in case you are worried about the extra e-waste compared to the mercury and sodium):
https://www.sciencedaily.com/releases...

Some general info on spectral sensitivity of the human eye:
https://light-measurement.com/spectra...

Basic info on light pollution (including relative impacts on sky glow) came from everyone’s favorite reliable source of knowledge:
https://en.wikipedia.org/wiki/Light_p...

Spec sheet for the Cree LED
http://api.icentera.com/v2/getfile.as...

Product overview:
http://lighting.cree.com/products/out...

More info on spectral misalignment:
http://www.patmullins.com/sodiumpollu...

Where Dr. Alan Lewis’ research is cited:
http://www.thelindy.com/uploads/Shoul...


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