I was curious as to what kind of heating elements people were using for their tanks, and how large their tanks were, after reading the thread about ambient vs. gradient temperatures. I'd been using 40 watt infra-red bulbs (I was afraid of hurting my pacs' eyes), one above each of my 10 gallon tanks, and I thought I was reaching temps in the low-mid 80's...but I recently moved the thermometer/hygrometer down to the middle of the enclosure and a few inches off the ground, and I'm finding that I'm not actually reaching anywhere near that. I'm a little bit discouraged, because I've been trying so many different wattages and light fixtures.
Maybe hearing what everyone else has will help me out. I have one UTH on the side of one of the enclosures, but I find that it doesn't to much. I keep my house on the cold side (around 65 F ).