What humidity for lights off "Night" ?

[The Humanure]

Grow store said bump up RH to 70% to get better VPD.
Hope I posted in the correct thread this time!
This is "Night"

 

[LoveGrowingIt]

VPD doesn't matter much when the light is off.

70% RH is a lot higher than I ever run mine. High humidity can invite mold and mildew.

How old are the plants?

 

[The Humanure]

5 week in flower. Not worried about lights off VPD. Just humidity issues. We keep our PH at a correct level so far no mold.