It's hard to create the natural environment, especially in the small tanks recommended for these frogs. In that case it's probably better not using infra red bulbs as light can still be seen from animals but doesn't seem to bother them as much. A ceramic heat emitter is better as it emit absolutely no light. I've found a daylight heat lamp to work in conjunction with a wall mounted heat mat for night time (frog will be able to use it as its above substrate) all I'm saying is it will not burn a frog, this is a rumour and any burns would be due to bad husbandry.