George Brainard

Humans have peak visual sensitivity to the yellow and green parts of the visible spectrum. But it is blue-white light—exactly of the sort most produced by cheap LEDs—that dominates the regulation of human circadian rhythms and other important biological cycles.
The wide-scale adoption of LEDs will reap huge energy savings, which is a good thing.
The question is, are the great energy savings compromising human health and ecosystems?

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