Are you talking that simplistic chart on vpd which gives no species consideration to leaf morphology or stomata type let alone the other 12 readings that require complex lab and field equipment costing more than all my grow equipment put together and is highly detailed on wiki and researchgate?
Ive actually completed the equation based on estimations given from various sites and the answer is meaningless to us mere mortals and even less so without complex dli data to make interval adjustments in real time.
Another load of simplistic hogwash and unless at extremes dismiss all humidity readings as you do not yet truly understand cannabis.