Papa_Tanswered grow question 4y ago VPD is good thing to keep in mind and being in the proper window for the proper life cycle. But to say that itβs going to really drastically change quantity. I donβt know. Thereβs so many factors that go into growing that all come together to the end result.
Do your best to keep up the VPD.
I havenβt always been at the optimal RH and Iβve got good results so far.