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D_Malik comments on Open Thread, Apr. 27 - May 3, 2015 - Less Wrong Discussion
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I've been doing the same thing for ~40 minutes of daily peak sunlight, because of heuristics ("make your environment more like the EEA") and because there's evidence it improves mood and cognitive functioning (e.g.). The effect isn't large enough to be noticeable. Sunlight increases risk of skin cancer, but decreases risks of other, less-survivable cancers more; I'm not sure how much of the cancer reduction you could get from taking D3 and not getting sunlight. I guess none of that actually answers your question.
My vague and untrustworthy impression is that D3 supplementation is better than nothing but has risks related to calcium going to the wrong places, which may be mitigated by Nitric oxide which is also sun linked, and might also be mitigated by not being K2 and magnesium deficient which most people are. I should probably start being better about archiving what I read so that I can stop being vague and untrustworthy.
I do notice a muscle and general relaxation effect which is deeper and lasts longer than, say, an equally warm shower. A blood panel I got back when I was not supplemented said I was pretty severely D deficient, so it might be that I feel the effects more. (Though from what I know of the biology of this the NO is more likely to be responsible for the relaxation effect than the D3.)
If you're white, you're no longer adapted to the ancestral environment where humans evolved.
Agreed, considering "EEA" to mean the African savannah. So for instance if your ancestry is European and you're currently living in California you don't need to spend very much time outside, and if you're dark-skinned and living at a high latitude you should try to get lots of sunlight.
Evolutionary selection pressures are strong enough that skin color of natives over the world corresponds to the level of sun exposure of various places.
Of course being indoors means that you get less sun then the environment for which evolution prepared you.