humidity % for flowering

Below 50% would be ideal but as long as you have a fan on them moving air they should be fine.
 
I agree with 420god for the most part. if your airflow isnt good in some of your grow area though you could still end up with mold. 60ish% at night kinda worries me a bit. i'd lower it if at all possible.
 
I was wondering the same myself. I have 2 plants in a closet with 2 4" passive intakes, a 4" inline fan with carbon filter and a 8" oscillating fan on 24 hours blowing along the tops of the 2. At night when I seal it up, the rH goes near 60 at times, the temp drops to 66 ish with cool outside air.

The fan and filter are definately removing the proper cfm air exchange rate and the fan blowing on the tops is moving the air across the tops pretty damn well I believe. So it sounds like I may be fine???
 
Well I just added an a.c and temps are dropping so I'll just go with the a.c and how should my humidity % be when lights are of
 
Its a purple strain anyway I guess my plant will turn purple from temp drop during lights off so thats really what I want anyway so right now my temp is 76 -78 and humidity % is 43-44 and that's perfect
 
60 degrees would probably do it. I wouldn't keep it at 60 for long periods of time while lights are off would probably be fine as it gets colder here than 60 in the fall.
 
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