re: Pet turtles

It has yet to be proven that RES need UVB. We funded a study that tested this and it was inconclusive. (To my knowledge it is the only study of its kind) We still recommend it because there are probably positive psychological effects for them at a minimum. But it appears that if they are fed a proper diet and the water quality is maintained, they will thrive without a source of UVB. Just FYI.

That link you provided has a lot of good information in it.