I personally don't use UVB for my snakes. Some natural light comes in through the windows during about 1/4 of the day but all my cages also have an area of shade the snake can use.

Check out the link below from a UK forum about UVB and research ongoing about it possibly causing cataracts... (are you part of this research group?) It's very interesting.

I would tend to think it could be bad since snakes don't have eyelids as lizards do, they can't close their eyes to avoid a UVB tube, just move into a hide or other cover.

Just some more ongoing research and a good read.
UVB causing blindness


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'There is a very fine line between "hobby" and "mental illness."' -Rainshadow

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