I agree with pretty much everyone here. I keep tabs on my substrate temps and even with the dreaded overhead lighting, they're always fine. Undertank heaters are definetly a great addition to heating, but I don't think it should be the only source of heat. From my experience, they ambient air temps don't get high enough, but that was over five years ago that I used one. And I'm not really down for having my room temperature at 85 in my living room. I would imagine that most commercial breeders, as someone said, don't use lights because it just wouldn't be practical for 1000 different enclousres. The lights would take up too much space and cause too much heat. I agree with the statement about the Earth's ambient ground temps, but if the sun can heat the ground why can't a light heat the substrate? I guess it really just comes down to what you need, for your needs, and personal preference.

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