Sorry for the double post I was not sure if you where the same person as I thought but I noticed in your other thread that you used a Zoo Med 100w. Is that one of those tight beam ones?
I tried these for awhile but could not get the temperature of the rest of the cage to stabilized. You might try switching to an incandescent for awhile period to see if that helps him out any. I believe those types of lights are more geared for aquariums. They can get one spot real hot with out all the extra side heat and an over heated aquarium. They look like flood lights but the inside construction looked different to me.