I just posted a simalar post to the General Herp forum also. My temps are very hard to regulate as well. I have my BP in a 10gal glass tank with one UTH and a heat light. My temps are either all warmer than the 85*F when I try to get the 90* basking spot, or there is only about 2* difference in the hot and cool end...having some serious problems with getting temps right. I get an average 87* warm side and 85* cool side. My temps stay within a couple degrees of each other...makes it real hard to get temp gradients right....