I decided to make a thread instead of badgering Tom again my situation is that I am mid process of building a Tegu cage for my baby argentine. The dimensions are 6 long 4 wide and 4 high. Basically today i got the caulking done and part of the door made, the front panel is not on, but we are getting there. it wont be long before i am decorating and lighting. But from my tortoise problems in the past I have learned all about closed chambers and the advantages of them, so of course my tegu's cage is basically a giant closed chamber. My question is, how do you heat and light something so big? I really don't want to deal with fluorescent UVB tube fixtures and i much prefer using the powersun mvb bulbs. I am using a 100w mvb right now in his old set up. I do plan on buying another heat lamp so that he has 2 lights in a row so that when he is big he can stretch out to get heat instead of being condensed into one little spot. I am thinking maybe a 100 watt powersun on one end of the hot side and then maybe like a 60-75 watt halogen bulb 3 feet away from the other so he has a basking area the entire width (4 ft) of the hot side. I also have a hanging socket sort of thing like youd use in a garage when working, I am thinking of hanging that on the "cool end" with a little 40-60 watt or so light bulb to provide a tid bit of heat but mainly light on the other side. Thoughts, suggestions?