I'll take a look at it.

It's true that I never got the substrate ideal (obviously). That was a drawback that I was hoping to figure out. The temperature gradient averaged 85 ambient with a 125 degree hot spot according to the temp gun. It took some work, but that was never much of a problem--the only temperature-related mishap I had was during the heat wave when ambient temperatures in my apartment were 120 degrees (melted rubber and candles!). Both lizard and I were unhappy then.