No problem, I don't wanna hear about a fire! The ones the canopies were designed for are these http://www.exo-terra.com/en/products..._heat_lamp.php

But honestly, if you're putting the heat mat on the bottom it should be just fine. I've used many 7w heat mats and I live in a cold climate. There's 3 things you need in your life, a an ET natural light probably 13 watts for your tank, a digital thermometer and a thermostat. Or you could go down the route of heating from just above but you'll need a light dome as you'll probably need at least a 50w