Morgan Morrigan wrote:I know the blue keeps me awake too...
Spanish researchers, no details. Assume it is UV ?
Probably UV. The way that "white" light is made with LEDs is to have a (usually) deep blue emitter striking a fluorescent surface that emits "white" light. Wikipedia shows a typical spectrum of such an LED:
https://en.wikipedia.org/wiki/Light-emitting_diode#White_light
The spectrum of the Philips "A-shape" (the funny bulbs with yellow glass parts) is here:
http://www.lighting.philips.com/pwc_li/us_en/connect/tools_literature/downloads/EnduraLED_A19-110726_2.pdf
Unfortunately, it too has a peak in the deep blue range.
Halogen bulbs also have a high UV emission and are therefore put behind UV blocking glass. Perhaps some filter will be developed for LEDs.
