It's all relative. Tosha is correct in saying there's a temp fluctuation. But it normally takes a bit of change to actually create condensation. Some fogging is fine, some slight condensation is fine but dripping wet is not (IMHO). However, if you look at some old videos (Barker or TSK, I can't remember), they periodically flip the glass over as it condenses and from what I remember there was quite a bit of condensation - dripping.
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Jay A. Martin
Jay Martin Reptiles

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