See, this is what I was taught at work. All reptiles and amphibians need UVA (at least, and having UVB and UVA is much better) bulbs, because they need to get the UV rays from the sun, which they can't do very well in a tank, and those light bulbs provide that. The UV rays helps them perform bodily functions.

I'm pretty sure that we would deny selling any reptile or amphibian if a person had no light.