Is this a panther chameleon?
The humidity in my cages isnt usually that high. But it does vary, from 40-65% and this doesnt cause any issues. Its highest when I am spraying/misting, and can spike for a short while to 80%, but its normally 40-65%
The temperature in the cage does not vary much. During the day the bottom of the cage is around 21/22C (70F), and the basking spot around 25-29C (80-85F). At night its cooler of course, especially in Winter, but never below 18C (65F).
I use a regular everyday household tungsten incandescent bulb for heat. The wattage you need depends on the cage, how close/far the bulb is to the chameleon, the ambient room temp, etc. I typically use a 40watt in summer and 60watt in winter.