Vapor Pressure Deficit (VPD) is an effective measurement instead of using Relative Humidity (RH). VPD is the difference between the amount of moisture in the air and how much moisture the air can hold when it is fully saturated.
In other words, 75% humidity can be good or bad depending on the temperature. If it is 58ºf, air is to wet at 75% humidity (Low VPD). If its 95ºf, air is to dry at 75% humidity (High VPD). 77º to 81º os the sweet spot.
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