temperature control

[rwg]

I'm trying to get the enclosure heating for my first snake (corn snake) just right. I started with a 40 watt bulb and lamp. The ambient temperature and temperature gradient were about perfect, but the basking spot (which I understand corns dont need) was too hot...close to 100F.

I just got a UTH, and tried that out for a few hours. Again, the ambient and gradient are great, but the floor gets too warm...about 100. My corn doesn't burrow a lot but he does on occasion.

My question is, if the floor is 100, is this hot enough to hurt my snake when he burrows down? Should I put in a reostat to lower the floor temp, and if so, wont this lower the ambient temperature out of the ideal range?