I should probably add that the 60 watt bulb I have is supposed to provide a basking temp of 90 degrees at 18 inches. Even with a probe in the tank directly under the bulb at this distance, it barely reaches 80.
use the bulb 80 degrees is fine as long as he has the option of more heat
you can also get a some of that foam board (insulation) form home depot and put in under and on the back and sides of the glass tank. Maybe over some of the top even. I think that would hold the heat in and you could sleep.
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