I use an 8 Watt ReptiTherm UTH from Petsmart. The glue on the underside is gone.
I keep the UTH under half an inch of Aspen bedding and then a cardboard mat above that. The surface temperature of the snake's lay is around 90-95 degrees. He does not feel too hot to the touch and his scales are not turning pink at all.
The ambient temperature is a constant 80 degrees, he is much healthier now with the new additions!