Well, you didn't believe me in that other thread, so I don't know if this is going to do anything, but here goes:
I read that too, and I tried it. Put the heat lamp over the water to cause evaporation and thereby increasing humidity. IT DIDN'T WORK.
Perhaps it works only on paper, or with general heat sources, but not reptile heat lamps. I'm guessing it sucks out more moisture in the air than created by evaporation. Whatever the reason, the tank humidity absolutely PLUMMETS when the heat lamp goes on.
And I'm a stone's throw from the coast. This is a beach community here. When the rest of Southern California is sweltering, we're cool, grey, and foggy because of the marine layer. We're not far enough inland for it to burn off and become dry. We're damp, grey, foggy, and humid, but switch on that heat lamp and bam! 70% drops down to 40% in less than an hour.
Try it for yourself. Just be sure to have an accurate hygrometer set up.
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