I use a 75 watt incandescent nocturnal black light to heat up one side of my 30 gallon tall. The whole tank shouldn't be in the 90s though. Just one side should have a basking area between 90-95 degrees, and the rest of the tank can be in the mid to low 80s. There will be a natural temperature gradient within the tank if you keep the heatlamp on one side. I figure if we incubate eggs which are much more sensitive than adults at 82-88 degrees, an average cage temperature falling within this range is pretty good. That's my setup and I haven't had any problems whatsoever.
How big is your tank?
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