If you use a CHE though, you should really use one of the wire-domes instead of one that's closed on all sides. Suckers can get _really_ hot. Make sure there aren't any pets around that can go sticking their noses in them either, I made the mistake of grabbing one to make sure it was tight in the fixture within a few seconds of turning it on and instantly got second degree burns on my hand.
I have both a red-light and a CHE to help control the ambient temp on the cool end of Shen's tank, but only the red-light is on during the day. Come night the CHE switches on and his tank is in "natural" darkness.