That's why I make sure my lamps are a) at least 8-12" away from the top of the enclosure (and that's the BOTTOM of the lamp), and b) that I use no higher than 50 watt bulbs. Doing those two things gets you a good raise in ambients, but doesn't overheat or drain humidity.

Also, those stand things are a rip off. I just built my own using wood: a thin plank for the platform, thick broom-handle-like dowels for the arms linked with a PVC elbow joint and a large hook screwed into the end. Worked great, but in the end I prefer clipping them to a wall shelf (gives extra storage space as well), or suspending from a hook in the ceiling with chain.