Temp and Humidity and Light Cycle

I am 49 days into this grow in my garage.
21/3 light cycle.

The tent is running in the mid 70Fs with 50-60% rH with lights on.

Lights off and the temp goes into the low 70s high 60s with a humidity in the 80s.

I have 4 fans moving air inside the tent constantly.

Do I run a risk of mold/mildew if I continue with lights off numbers like this for just 3 hours?

Would running the light 24/0 at this point cause the plants to hermie or other issues?

 

[SHRED]

I would increase the exhaust fan during lights out. Cooler temp OK if humidity drops to safer level, check VPD charts.
It's not clear to me if the thermostat is controlling a heater or exhaust fan.

It controls my exhaust fan.

https://inkbird.com/products/temperature-controller-itc-308-wifi

 

[Zaaboot]

hey @SHRED - I have a similar set up in the garage, but the tent sits in a small insulated stud lung room.
Before I built the room I did one run just in the garage and I had the same issue - I connected the Phresh to an EC1 controller and set the temps and it dealt with speeds this way the fan stayed on all the time but at a very low speed when lights were out and RH was high, at the same time I connected the Inkbird to a tube radiator sitting on the floor of the tent - between the Inkbird and the EC1 it kept things stable enough and in range.

 

[YYZ]

Is the fan set to run above or below a temp setting?
It might be easier to run the fan on a $5 harbor freight timer and
get a small heater controlled with the T stat.

I'm in a garage, plants med/small about 5 weeks.
Small heater on T stat set at 65F, off above 65F
lights 18/6
Fan off lights on / fan 15min on 15min off lights out.

Lights on about 67-73F 50-60RH, lights off 60-65F 55-65RH
As the plants get larger the fan needs to be run more, plants in late flower
slow down and put out less humidity, this help lower RH when you want it the lowest.

Nice looking plants, it would be a shame to lose it all to mold.

 

[SHRED]

Is the fan set to run above or below a temp setting?
It might be easier to run the fan on a $5 harbor freight timer and
get a small heater controlled with the T stat.

I'm in a garage, plants med/small about 5 weeks.
Small heater on T stat set at 65F, off above 65F
lights 18/6
Fan off lights on / fan 15min on 15min off lights out.

Lights on about 67-73F 50-60RH, lights off 60-65F 55-65RH
As the plants get larger the fan needs to be run more, plants in late flower
slow down and put out less humidity, this help lower RH when you want it the lowest.

Nice looking plants, it would be a shame to lose it all to mold.

I fit my dehumidifier in there.
It's a lot better now.