What's worse for plants during flower? Fluctuating temperature or fluctuating light intensity?

nunyabidness420

Well-Known Member
I'm setting up a 3x3x3 grow space with a fixed air extraction rate and an AC.
The AC is not equipped with an inverter so it will cause the temperature to swing up and down if I use that to control temperature.
I was thinking of keeping the AC on all the time and varying the amount of light the plants get to keep temperatures at a fixed level.
Alternatively, I can keep the lights at full power and turn the AC on and off which would cause temperature swings.
The equipment list is fixed so I can't just add an invert AC and the air extraction rate is fixed as well.
Which method would you pick?
 
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coreywebster

Well-Known Member
What do you mean the air extraction rate is fixed? Just get a temp controlled fan or fan speed controller.

Temps fluctuate in the real world. Its no big deal provided they are in a reasonable range.
 

nunyabidness420

Well-Known Member
What do you mean the air extraction rate is fixed
It means I can only pump so much air through a wet scrubber and expect what comes out to be free from odor.

Just get a temp controlled fan or fan speed controller.
I will one of those connected to a carbon filter as a back up, but I don't want to use it as my primary.

Temps fluctuate in the real world. Its no big deal provided they are in a reasonable range.
Yeah I'm thinking a 3~5 degree range shouldn't hurt.
 

nunyabidness420

Well-Known Member
Extracting air and running an AC? I am confused.
I will be pulling about 6 cfm of air out of the enclosure to make sure no odors are leaking out.
You can think of it as a sealed room.

I can either turn the AC on and off and get ~5 degree temperature swings due to the small size of the enclosure.
At least I'm hoping for 5 degrees, I'm sure there will be hot and cold spots with greater fluctuations.
Or I can keep the AC running and adjust the amount of power I am giving the lights to maintain a constant temperature and get about 15~20% changes in light intensity.
 

nunyabidness420

Well-Known Member
dumb ass, check your local weather forecast and see how much the temp changes from day to night and from day to day. you're worried about 5 fucking degrees?
moron, has it occurred to you that temps might change by more than 5 degrees? have you never been outside before?

yeah, I'm worried about 5 fucking degrees, cause I care about consistency in my buds, got a problem with that?
 

ilovereggae

Well-Known Member
moron, has it occurred to you that temps might change by more than 5 degrees? have you never been outside before?

yeah, I'm worried about 5 fucking degrees, cause I care about consistency in my buds, got a problem with that?
you are 100% overthinking this.

serious question is this your first grow or are you dialing in your current environment?
 

.Smoke

Well-Known Member
Get this...
Plug (I'm guessing) window ac into it.
Place probe over canopy and you can have the A/C kick on/off if the temp moves more than 1 degree.
 

nunyabidness420

Well-Known Member
you are 100% overthinking this.
yeah I probably am... I was high as fuck when I first posted :eyesmoke:

serious question is this your first grow or are you dealing in your current environment?
Not my first grow. But my first grow wasn't the same as my second, or my third, or anything like my recent grows. Hence the move towards worrying about 5 degrees.

Dealing in my current environment?
 

nunyabidness420

Well-Known Member
serious question is this your first grow or are you dialing in your current environment?
The will be the first grow with this strain and in this environment.
I think the important thing is eliminating as many variables as I can.
Temps will effect the buds just as changing light levels will.
So which one do I eliminate?
 

ilovereggae

Well-Known Member
Not my first grow. But my first grow wasn't the same as my second, or my third, or anything like my recent grows. Hence the move towards worrying about 5 degrees.

Dealing in my current environment?
Sorry that was a typo, I meant "dialing in".

I get it, we always want to make things better. When I switched to lights on at night, my temp swings went from 20 degrees to 10 degrees, and it definitely improved yields.

But with lights on and an AC running that slight fluctuations is only going to be a couple of degrees. As long as you stay in the zone and your vpd is good your plants will be happy. I would definitely do that rather than adjust your lights to try to adjust temps. Not only is that going to shorten your drivers lifespan, im not even sure it would even work. Ambient outdoor temps are going to cause indoor temp fluctuations anyway.
 

nunyabidness420

Well-Known Member
Sorry that was a typo, I meant "dialing in".

I get it, we always want to make things better. When I switched to lights on at night, my temp swings went from 20 degrees to 10 degrees, and it definitely improved yields.

But with lights on and an AC running that slight fluctuations is only going to be a couple of degrees. As long as you stay in the zone and your vpd is good your plants will be happy. I would definitely do that rather than adjust your lights to try to adjust temps. Not only is that going to shorten your drivers lifespan, im not even sure it would even work. Ambient outdoor temps are going to cause indoor temp fluctuations anyway.
Understood, as long as I'm in the zone, a few degrees shouldn't matter.:weed:

The drivers can handle that easily. I can adjust them a lot easier and accurately than I can adjust the AC, even if I had an inverter.
 

Herb Man

Well-Known Member
The pants thrive on good intense light. In the flowering stage of the plants life warm days and cold nights are ideal to get the plants frosty and sticky.
 

ejsesp

Active Member
Sorry that was a typo, I meant "dialing in".

I get it, we always want to make things better. When I switched to lights on at night, my temp swings went from 20 degrees to 10 degrees, and it definitely improved yields.

But with lights on and an AC running that slight fluctuations is only going to be a couple of degrees. As long as you stay in the zone and your vpd is good your plants will be happy. I would definitely do that rather than adjust your lights to try to adjust temps. Not only is that going to shorten your drivers lifespan, im not even sure it would even work. Ambient outdoor temps are going to cause indoor temp fluctuations anyway.
Wow your plant looks great
 

Harvest76

Well-Known Member
The pants thrive on good intense light. In the flowering stage of the plants life warm days and cold nights are ideal to get the plants frosty and sticky.
A little late to the thread, but this is what works for me too. I'm 7 weeks into an 8 maybe 9 week flower. Gelato and NicolexBanana. I keep it at 74 during the day and 64 at night. They love it, and the buds get so fat and crystallized. Most little bugs dont care for the cold, so there's a bonus too. The daily swings of 5 degrees are nothing I even think about, but that cold at night is a prize winner. Not a sativa guy, so cant speak to how those react.
 

Harvest76

Well-Known Member
Ambient outdoor temps are going to cause indoor temp fluctuations anyway.
This is important to remember. You'll never be able to "control" the environment perfectly, because the weather and climate outside is still going to affect the inside. I grow in a basement, a generally even environment, and the humidity and temps definitely still fluctuate with the seasons. Your best bet is to invest in climate control equipment and monitor the ranges. I use a Govee Bluetooth hygrometer/thermometer, portable ac, fans, heaters, humidifiers and dehumidifiers, and exhaust. I can look at the data over an hour, day, or month and adjust accordingly. Dont sweat what you cant control, just work with what you have.
 
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