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Does LEDs work for treating Seasonal Affective Disorder or just full spectrum?


Has LEDs been proven affective in treating SAD, if so how much is necessacary?

You need to have full spectrum to have the results your looking for. Many studies have been done on the Alaskan inuits with regards to SAD and the effects of photo therapy. There have also been multiple studies done in several nursing homes in Oregon, Colorado and Wisconsin. Both LED and full spectrum (artificial sunlight) sources have been used in these studies and the full spectrum light source gets the results hands down while the LED gets absolutely none. As to how much, the studies that I've seen vary between 20 to 45 minutes a day to obtain moderate elevation of mood.

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