Are you housing crested geckos? They are pretty forgiving on temperature so not sure if you would even need a heat lamp. In fact, I think a heat lamp would get way too hot for them unless you use a dimmer switch.
In any case, I don't see an issue with putting mesh on the lid, but only if you use a dimmer switch to control the temperature. Also it is worth noting that the humidity will escape mostly from the top, so the more mesh you put on, the more you lower the humidity. Using a heat lamp will also decrease your humidity. So get your spray bottle ready. lol









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