More or less, UVA and UVB are known to cause cancer. They are deep penetrating rays. Which is why they can excite the conversion of D. at lower TEMPS. Higher temps also converts D. Higher temps also do lots of other things, immune system, etc.

UVA and B cause blindness. which by all means is harmful. But I do not think the bulbs that are sold are strong enough for anything, including the conversion of D.

Also all these animals develop methods to avoid harm from the rays of the sun. For instance, varanid skin, is suppose to stop 100% of UVA and B. Cheers

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