Someone just suggested tin foil. It's UGLY, but it's worth a try... summers are fine here (and the light gets unplugged). It's just way too cold right now, which is why I use the light with the UTH... For next winter though, I'm DEFINITELY going flexwatt.
This is my concern though (with the UTH). I tested this out on the 40 gallon (36x18) before I got a second snake. I can get a steady 95 on the UTH (11x17), and 50-55 on the cool side.
Flexwatt will give me a better gradient though, right? I mean 10 degrees is good... 40 is NOT. lol