2018-06-19

[public] 1.06M views, 46.6K likes, 764 dislikes audio only

Technology Connections

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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/pdf/GrotonFinalReport.pdf

US Department of Energy’s information on blue light sources in street lighting:

https://www.energy.gov/sites/prod/files/2017/03/f34/Street%20Lighting%20and%20Blue%20Light%20FAQs.pdf

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/2010/03/100308132136.htm

Some general info on spectral sensitivity of the human eye:

https://light-measurement.com/spectral-sensitivity-of-eye/

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_pollution

Spec sheet for the Cree LED

http://api.icentera.com/v2/getfile.aspx?f=E9CE983DDF2101638FA38D240926FE55E07EDD8D97F195ABD14AC9FFAF3CAF03C2995E6AD9E245B0

Product overview:

http://lighting.cree.com/products/outdoor/street-and-roadway/xsp-series

More info on spectral misalignment:

http://www.patmullins.com/sodiumpollution.html

Where Dr. Alan Lewis’ research is cited:

http://www.thelindy.com/uploads/Should_vision_influence_roadway_lighting_design.pdf

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