“We’ve done a number of studies to show that light levels that you would be normally exposed to in the home in the evening, for example from a bedside lamp, are very easily capable of shifting the body clock,” Dr. Lockley said.And this doesn't merely mean light that appears blue, but applies to any light that has blue wavelenghts, which would include almost all CFLs and white LEDs.
Lockley said blue wavelengths, in particular, the kind emitted by energy efficient light bulbs and various electronics, can be the most disruptive.
“And yet now-a-days it seems that blue is the color du jour,” said Dr. Nathaniel Watson of the American Academy of Sleep Medicine.
In addition, studies have linked blue light to depression, diabetes, obesity and cardiovascular problems. ...
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Not quite the same thing, but might fit the bill
posted by Ruthless Bunny at 7:10 AM on July 31, 2012