You do realize that not all reptiles are the same? Everywhere around us has some strength of UV radiation. The question is how much? Some need a lot of exposure, some need very little or seemly none at all. Also it is debatable since some reptiles such as Blue-Tongued Skink are so hardy, it take years before the effects of improper husbandry to appear, and sometimes people can't pinpoint where they went wrong with the husbandry.
Turtles and tortoises do need UV, or their shells don't form properly. Diurnal lizards such as Iguanas and Bearded Dragons need UV as well. Snakes and monitors don't need as much UV, which means they don't need aided sources and are not needed for husbandry purposes, since they are evolved for [FONT=Arial, Verdana, sans-serif]fossorial[/FONT] life. It should be noted that when snakes and monitors are exposed to UV, they produce better colour. This is why you see some professional display setups with UV lightings.
Reptiles is an outdated scientific terminology from an academic point of view anyway with all the new genetic and cladistic evolutionary information out there. I means turtles evolved separately from lizards and snakes; and crocodilians and birds evolved separately from all of them.
