What temps are you running with lights on? Are you shooting for VPD parameters? I did say humid air!I am not being argumentative here but this statement is false. At least in my particular set up it is. other factors like where you live, time of year and size of your space are points you have to consider, I live in southern midwest and I have my dehumidifier set to kick on right when the lights go out. Usually, my RH is around 55% to 60% right before the lights kick off then literally, in about 30-45 minutes my RH has dropped to the low 40% range. I have it set on a timer to run 30 minutes on 60 minutes off and repeat. This keeps the RH in check in a range of 40% to 43% till the lights kick on then I don't run the dehumidifier during lights on and the RH never goes above 55%. Trying to get the most out of the equipment I have from an energy/efficiency stand point. During the late stages of flower when the fruits get fatter I will run the dehumidifier to keep the RH 45% and below till harvest. Been doing it this way grow after grow with no issues.
Peace