I've been using a Philips Natural Light 75w halogen for a couple months now. The thing grows cheato like crazy but it does throw out quite a bit of heat. I only have it about 4 inches over my sump because there isn't more room in the stand and I broke 2 glass covers with it. If you can put it up a little higher it would probably work really well for you.
It was under $10 at HD.
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