I've just been reading in Taste for Life that Vitamin D is important for combatting depression. The Seasonal Affectation Disorder that you get is not merely because you aren't seeing light -- it's because the sun supplies Vitamin D. It's considered healthy to be in the outdoor sun for 10-15 minutes a day.
But I think that you need to have appropriate UVA or UVB rays to process the vitamin D that's in your system. If you're just taking the capsule, I'm not sure that it's doing much good. Any experts in this area? I don't know this for a fact but this is what I've heard.
I think spending 10 to 15 minutes daily in Sun shine enough for him and shid not need UVA and UVB rays. If she has some pigmentation problems due to auto-immunity e.g
Vitiligo then she should have use UVA or UVB