If you guys want to learn more about VPD check out https://getpulse.co/ for some great info. Below is the chart for VPD what are the recommended humidity levels against certain Temps.
This is for the growers that really want to take their grows to the next level. You can see up to 30 to 40% increased production from plants living in a dialed in VPD Environment.
BLUE - what I would recommend for night time VPD
RED - what I would recommend for day time VPD