KarateChopMaster
Active Member
Growing autoflower at 18/6. Should I be keeping the humidity the same during the dark time as I do for light?
Wow thats warm! Maybe i should try to let my humidity rise during the day, i went to 90 a few times with 50% humidity and the plants werent happy lol.60-65% when lights are on, 40-45% while lights are off.
Those are just a basic set of numbers that will keep you fairly safe.
Myself I try to maintain my rooms VPD (Vapor pressure deficit) around 1kPa. So at 90⁰f, I run about 74% humidity while lights are on but then during lights off, I drop down to 40-44% humidity.
Wow thats warm! Maybe i should try to let my humidity rise during the day, i went to 90 a few times with 50% humidity and the plants werent happy lol.
I am running a pretty aggressive set up. CO², Quest dehumidifier, AC, sealed room. Keeping the VPD at 1KPa in conjunction with the CO² has allowed me to run these higher temps and honestly with the LED lights, I need the temps up there to get the most out of the CO² that I am adding to the rooms environment.
Why 1.0 kPa? I'm pushing as high as 1.6 kPa with the same type setup except I'm running 1000w DE HPS. If your running a high CO2 wouldn't you want a higher VPD to account for the increased photosynthesis and metabolism of the plants?