John kush93
Active Member
switched to flower today, just one concern is when lights on temps like 28.5c - 29.5 with humidity at 44-46%, and now the lights of the temps gone down to17.5c with humidity of 78%, is that okay ??
switched to flower today, temp drop and humidity question
- Thread starter John kush93
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natureboygrower
Well-Known Member
no.your humidity is way too high.do you have exhaust fans?
John kush93
Active Member
Carbon filter ? Yh
John kush93
Active Member
Is it ok at 44-47% when lights on?
John kush93
Active Member
What is the max humidity I want during flower ? And are my temps ok?
natureboygrower
Well-Known Member
yes.thats a good %
natureboygrower
Well-Known Member
what are you using for lights? some cob guys would say 86°f is where you want to be.i woudnt go above 55% humidity in flower,but shit,im an outdoor guy mainly.maybe a more experienced indoor grower will chime in
John kush93
Active Member
600w hps in a 1 metre square space 
John kush93
Active Member
What about the drop in temp when lights of at like 17c from 29celsius
natureboygrower
Well-Known Member
nice bushes youve got there.look healthy in the pic.i would definitely think about running a dehumidifier at lights out if you cant get your humidity down.
quite a drop.my outdoor plants have swings like that into lower temps without problems.id be more worried about your humidity.high humidity and temp changes like that could lead to problems
John kush93
Active Member
What could I try to get humidity down, befor getting a dehumidifier, what about heating room that the tents in while the lights off, and adding another 4" carbon filter could that help ??
ThatSpudGuy
Well-Known Member
Rule of thumb is that you want it to only be around a 5 degree Celsius drop in the difference so as not to stress the plants. They can handle the temps of about 27c / 28c but the sweet spot would be around 24c /25c . Get yourself a air cooled hood to vent that hot air and help keep temps down
John kush93
Active Member
I can't really afford one at the min, what about putting a isolating fan in tent blowing between the light and top of plants
John kush93
Active Member
Osolating
ThatSpudGuy
Well-Known Member
You should always have a fan in there to help with blowing the hot and humid air around and to prevent any mold spores getting time to form. What strain is it? Some strains can handle temps as high as 30c
John kush93
Active Member
Blues and bubblegum, and I haven't had one in because the temp would be at like 24c which is a bit low ain't it ?
coreywebster
Well-Known Member
If that's your thermometer hanging right below your light then I wouldn't worry too much about that temp because its probably not as high as it suggests.
You want a proper grow room thermometer and have it hung just above the light line out of direct light so the radiant heat from the HPS doesn't warm it up. By doing so you will get a proper air temp reading.
For the RH just get a small dehumidifier and have it on when lights are off.
You want a proper grow room thermometer and have it hung just above the light line out of direct light so the radiant heat from the HPS doesn't warm it up. By doing so you will get a proper air temp reading.
For the RH just get a small dehumidifier and have it on when lights are off.
coreywebster
Well-Known Member
Not too low no. Not with HPS.
John kush93
Active Member
I have a wireless one that sits in tent that shows me it with out opening tent it just hangs at plant level at side of the tent
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John kush93
Active Member
That humidity is way to high ain't it how can I lowered that with out buying dehumidifyer, and I wouldn't even fit one in tent