I haven't used one myself. The only thing that concerns me, is what if the sweet spot for the UVB is too hot as a basking spot? Depending on how hot they are, it could be an issue. It would be harder to tweak than changing the wattage of a basking bulb, or raising the bulb farther from the cage. Since I've never seen one in person, I'm not sure if that would even be a problem, though.