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About health and full-spectrum lighting, the Lighting Research Center's NLPIP report explains that short wavelength (blue) light is predominantly effective at regulating the human body's circadian system; long wavelength (red) light seems to be inconsequential to the circadian system.
In the study, NLPIP performed photometric evaluations of 14 streetlights that used either HPS, pulse-start metal halide (PSMH), induction lamps or LED modules.
The NLPIP found that if LED or induction streetlights replaced the pole-mounted HPS streetlights, it would take twice as many of the streetlights to meet the lighting criteria as defined in RP-8-00.
The NLPIP's finding were published in a Specifier Report, which is available online at www.lrc.rpi.edu/nlpip/publications.asp.
On October 13, the LRC responded to the PNNL as follows: "The NLPIP believes that the Gateway program has not provided neutral comparisons between streetlights with LEDs and other light sources.
These were the specific objections enumerated by NLPIP:
* One Gateway report did not compare LED luminaires against HPS sources, which are the most commonly installed outdoor area luminaires and which NLPIP found most cost effective for collector roads from the models tested.
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