I dunno, Mykee.. how do they benefit from the overhead heat source in the wild? It's simple. They, like all other reptiles, bask in the sun when they are digesting, even if it means coming out of hiding. Likewise, they depend on air temps, not surface temps. If the air temp is 95 degrees even in their hide box, they are fine. Another thing you can do (which I have done before) is put a hole in the top of the hide.
As for the light bulbs drying out the air, this is simply not true either. Put a water source near the overhead light, and watch the windows fog up. When I had an amazon tree boa in a custom enclosure with overhead lighting, all I had to do was mist down the walls of the enclosure once a week, and the humidity stayed at 90% at all times.
Sorry to keep bursting the myths about overhead lights here, but I must admit is is kinda fun sometimes.
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