First grow - Fridge - have questions

Hey there, I've got a pair of pineapple chunk plants I'm growing, just flipped the lights this week. I took an old fridge I had, gutted it, cut a hole in the top and bottom, mounted a 210cfm fan to the top connected to a thermostat. I've also got a small fan inside pushing air across the plants. Lighting is a Blackdog LED BD240-U. Pic is from a month ago, I've got two plants that I am flowering now


My question:
The fridge is in a shed that has no climate control. I have the thermostat set to 70*F. Ambient temps here are between 50*-80*F, lower the last few days as we've had a cold snap. During the day, when the light is on, the fan will cycle as the interior will heat up, the fan will turn on and draw cool air in, and turn off, figure its running about 30% of the time. At night, when there is no light, the fan won't be cycling as no heat is being generated. Is this a problem? Is airflow critical when the plant is "sleeping"? Is it worse for there to be less airflow, or for it to be colder? Should I be using a heater at night? The lowest temp I've seen is around 60*F, however that is with the fan not running all night.

Thanks in advance for your input

As fall comes it would seem normal for temps to dip at night.
I think you are safe with your temps, as far as fresh air,
You could leave an internal fan running 24/7 so air is not static.

I find that when the temps get cool like that, I have to periodically replace the air to prevent the humidity from increasing and eventually forming dew. I don't want dew on my BD-240

yeah, its definitely forming condensation in there overnight. sensor reads max humidity at 99% overnight. gotta figure out a way to cycle the fan once an hour....

anyway, heres a pic. the one on the right sprouted 10/18, has been topped. The one on the left sprouted about a week later and hasn't been touched besides pruning the bottom. so 6 and 5 weeks respectively. turned on the timer a week ago, nice pistils on both plants interested to see which one yields more. topping is definitely a more efficient use of space.
white balance on the rear wall makes it impossible to get a decent shot under the LEDs...

You are very likely going to experience mold problems when buds start to swell up if you have humidity levels that high. I leave my exhaust fan on 24/7 and have any fans that blow on plants on only during "lights on". In my experience plants are susceptible to wind burn if you leave any internal fans on all the time. As far as your temperature goes, I cant give you an exact answer but if you run your lights at night it really helps to stabilize day/night temps. Otherwise get a heater like you said, just gotta play around with what your working with. Nice lookin plants btw

I used a SPDT relay on my fan so that I can have a separate timer turn the fan on for 15 minute intervals, once per hour, when the lights are off. When the lights are on, I use a temperature controller to turn the fan on when the temp gets high.

is it a bad idea to run the lights 11 on/12 off for 6 days (pushing the light on time an hour back each day) to transition the light to be on during the coldest part of the evening?

3rd week of 12/12. buds starting to really pop. added a pair of 40w CFLs on the side to supplement the buds that aren't directly under the LED. Got a small dehumidifier coming, got two tubs of damp-rid in there for the time being. Definitely going to need it.

I've always wanted to do a fridge.

geniusgza said:

is it a bad idea to run the lights 11 on/12 off for 6 days (pushing the light on time an hour back each day) to transition the light to be on during the coldest part of the evening?

Click to expand...

No. Leave the lights off until you want them on again.

The messed up gradual shit will stress yer plant.