zlacker

I'm assuming you've never spent a winter somewhere with less than 3 hours of daylight during the winter months. I don't think anyone who has would question the effect of sunlight on mood.

When I lived such a winter, the effect of standing in full sunlight when it was available was like eating sugar after heavy exercise. (And biochemically, this makes perfect sense given that we know the body uses sunlight to synthesize essential compounds.)

It makes sense to question the effect of a specific lamp, but the body's need for sunlight is obvious, even absent the scientific research.