For the first week or so I only had a UTH under one side of the tank, but I noticed the temps were a little low (we just turned our a/c on, it was barely 82 on the warm side) so I bought a 150-watt ceramic heat lamp today. Because of the setup of the tank (it is on a metal shelving unit, on the 2nd shelf down, so there is another metal grated shelf about 5 inches above it), I have 2 options for the lamp:

1) Place face-down on the shelf above, so it's not right on the cover, leaving about 4-5 inches between the edge of the lamp and the top of the tank. Will the heat waves go down far enough to efficiently heat the tank, or

2) Clip onto the shelving unit so the lamp is flush up against the warm side of the tank? The problem here is that if it's right up against the glass and is more towards the lower half of the tank where it's easier to get to, will he get burned when he climbs up the side of the glass like he does from time to time? When I moved the lamp to the top shelf facing down, after 5 minutes I felt the glass on the side and it was really hot to my own touch from the outside (didn't feel the inside but I can't imagine it would be much cooler).