ALso i've read a few studies that show in the wild australian lizards such as bd's usually dont get more than a 5-7% exposure to uvb. Due to the fact that they arent always in the desert they are in woodlands,rocky outcrops, etc. With trees, leaves, etc filtering out some of the uvb from the sun, and anything more than what they are getting in the wild isnt any more helpful and can actually be harmful to some extent.