My belief is that the whole UVB arguement gets oversimplified. It is known that primates need it, but as little as 15 minutes on part of the body can be enough for weeks. There are obviously many mechanisms for aquiring sufficient calcium or animals that are primarily nocturnal would never have enough.
Keeping herps properly is kind of like practicing medicine or law. It takes a lot of experience from many different people, and practice and attention to the animals. As stated, if some aspect of the husbandry is off, you MAY be able to make up for it in other ways, i.e. full spectrum lighting.

Just my thoughts,
AH

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