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Well, I understand that going just by the number on the hygrometer. It may not lower the number you see, but “in essence” or “effectively” it creates a situation where the 65% RH comes off to the plant as a lower number. The RH number is a measure of the air RH and temp. The leaf temps are a different story with moving air. That’s why I said effectively. Maybe not the clearest word I could have used, and this is just a theory. I can’t prove what I say, although as soon as my IR thermometer arrives I can try to show you what I mean, and frankly confirm my theory or discount it. But the idea is that just as the wind outside will push wetter air off the leaves and replace it with less humid moving air, effectively lowering the RH on the plant even as the air around it may measure heavier, same idea. Feel free to tell me why I’m completely off base.It definitely explains your environmental controls, but I was confused when you said this:
I'm not sure how you measure "effective" RH. Isn't the RH whatever it says on your hygrometer? Moving 65% RH air around with fans doesn't lower the humidity to a different "effective" number. That's why I asked if the fans were bringing in lower RH from outside the tent.