In florida, I agree that there is not real need for a lamp. I would put a small UTH just so the snake has the option to warm itself up, but I don't think that you should do much more than that. The problems you may have with a lamp is that you will cook the entire inside of your viv during the day, but at night, temps drop way more than normal. Even if you get a spot lamp that concentrates the beam of heat in one area, the heat will still dissapate over the entire viv. A UTH gives them a place to warm up if they need it 24 hours a day, yet will keep the rest of the viv cool enough that he can still cool down, and won't be subjected to a temp too warm for him to be comfortable. Leave it up to them...they know best anyways.