I am fairly new to the hobby and had some questions about UVB lighting. I have 2 leopard geckos, 2 corn snakes, and a bearded dragon. I have UVB light for the beardie, but was wondering if I should also give the leos and snakes some UVB light. If so, how much and how long. Would it be ok to use it in a 12/12 hour day like I do for the Beardie? Thank you all.