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I find this subject interesting. I have pet reptiles that need light with UVB, it helps synthesize d3, without it they are sluggish and die. At a counselors once direction I try to be in natural sunlight 10 minutes a day. I feel a difference if I am not.
My mother thought I was joking when I out a reptile lamp on her desk where she spends 10 hours a day, but after a few days she was more productive and less aggitated.
I was unable to find research on this, but ahve found that a tanning bed (also uvb) helps and has been studied
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