Color-changing “tunable white light” sources are being promoted for schools, office buildings, and healthcare institutions. Media presentations have focused on reducing or eliminating blue light at night. Most people now know that light and the color of light-more specifically, the spectral power distribution or wave length-affect our circadian internal clock. Mariana Figuerio, director of the Lighting Reach Center and Light and Health program director, reported that only those people sitting directly next to windows receive benefits of circadian stimulus from daylight and only when faced looking directly out of the window. At the recent Illuminating Engineering Society (IES) Light and Human Health Symposium in Atlanta, Dr.
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