The OP has not asked if the sulcata needs uvb or not so I'm baffled as to how we got here.
But since we have, I agree with Arcadia John that providing uva and uvb is ultimately a welfare issue as well as a health one. The difference is that he works for a company that makes these things and are in business to sell products so they have a vested interest, which I don't.
Tortoises can definitely see uva and uvb and seeing those parts of the light spectrum is linked to activity and behaviour patterns. Why wouldn't we provide any? To save a few quid?
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Testudo Hermanni Hermanni (Corse) tortoises
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