Minimum lights on temp.

So after building a aircooled 500wat Cob light to control heat issues. My room now runs 1-2F above ambient air tempature. Which is great.

BUT

Being my tent is in the cool basement to of the house. I am running 69-73F through the lights on cycle.

Recommend temps are 75-80F in flower right.

Should I worry about it?

Adding heat while the exhaust fan is on is a waste of hydro IMO.

Any advice?

For LED and COBs aim for 78 minimum.

Bookush34 said:

So after building a aircooled 500wat Cob light to control heat issues. My room now runs 1-2F above ambient air tempature. Which is great.

BUT

Being my tent is in the cool basement to of the house. I am running 69-73F through the lights on cycle.

Recommend temps are 75-80F in flower right.

Should I worry about it?

Adding heat while the exhaust fan is on is a waste of hydro IMO.

Any advice?

Click to expand...

I keep my rooms at 74-75 day and night I would urge you to keep yours up. I’m in a Mi basement I simply have my rooms controlled via my geothermal

I limit my temps to 71 to 73 ambient. I use HID so I'm doing a thermal clime zone type of thing....

Up to around 80 F at the canopy

Mid 70's at the the mid plant point and 68-71 at the pot level.

GREAT production and quality.....Growing for potentials...

ANC is correct for LED temps - ambient...

I have a 4” in-line with filter exhausting the tent to the outside of the house. And a 6” in-line pulling air threw the hood and dumping into another room.

If I put the 4” on a t-stat. Is doesn’t cycle enough to keep humidity levels in check.

Unless I pump the heat into the tent.
Which seems like a waste to dump it all out side.

What are my options ?

Lordhooha said:

I keep my rooms at 74-75 day and night I would urge you to keep yours up. I’m in a Mi basement I simply have my rooms controlled via my geothermal

Click to expand...

Why no night time temp difference?
I am under the impression that 10f is the ideal spread for night vs day temp?

Bookush34 said:

Why no night time temp difference?
I am under the impression that 10f is the ideal spread for night vs day temp?

Click to expand...

Not necessarily needed plus i piped my second zone of my geothermal into those rooms so it’s just how I’ve had it for some years. Never seen much of a issue. If not the area in my basement can get a little cool not cold but can hover around 78 to 70 especially with the cold weather we’ve had this year.

Maybe have the tent exhaust back into the room instead of outside.

Then the 6” fan for the hood would suck it threw the hood and out into the house.

Bookush34 said:

Maybe have the tent exhaust back into the room instead of outside.

Then the 6” fan for the hood would suck it threw the hood and out into the house.

Click to expand...

Use the 6 inch and simply have it on 24/7 run the tent with a passive intake an create a good negative pressure in there it should take care of the issues but exhaust it outside not back into the room

Bookush34 said:

Why no night time temp difference?
I am under the impression that 10f is the ideal spread for night vs day temp?

Click to expand...

I like to keep about a 10 degree difference but keeping the day / night temps equal or even night higher will limit stretch and grow more compact plants

I have seen this in my room as my summer differential is much closer than winter in my house and my plants seem to grow taller especially the viney strains in winter.

Also tons of info on the internet. Search day/night temp differential for plants.

MichiganMedGrower said:

I like to keep about a 10 degree difference but keeping the day / night temps equal or even night higher will limit stretch and grow more compact plants

I have seen this in my room as my summer differential is much closer than winter in my house and my plants seem to grow taller especially the viney strains in winter.

Also tons of info on the internet. Search day/night temp differential for plants.

Click to expand...

are you MedGrower1 on youtube? just curious!

ShLUbY said:

are you MedGrower1 on youtube? just curious!

Click to expand...

No. I’m not another michiganmedgrower on ig either. Lol

I’m getting more generic every day it seems.

I think they grow fine at a constant temp all night.

But i make em cold a week before chop to get them oils going


I think the whole 10 degree difference thing is more of a guidline of how cold you can go before slowing growth

Lordhooha said:

Use the 6 inch and simply have it on 24/7 run the tent with a passive intake an create a good negative pressure in there it should take care of the issues but exhaust it outside not back into the room

Click to expand...

6” fan draws from out side tent.
The 4” draws from inside the tent.

The 4” on low (24/7) is causing my low temps.

Bookush34 said:

Why no night time temp difference?
I am under the impression that 10f is the ideal spread for night vs day temp?

Click to expand...

Cold$moke said:

I think they grow fine at a constant temp all night.

But i make em cold a week before chop to get them oils going


I think the whole 10 degree difference thing is more of a guidline of how cold you can go before slowing growth

Click to expand...

You all should note that any Sativa or Sativa dominate strain. Tends to "like" a minimal temp drift at night. After all, they came from climates that only change about 4-8 deg F all year long. Much less day to night, being any "big" shift... Besides, it's the soil/media temp change that effects the growth more then air temps! The colder your media - under 65 - the more they slow and at under 60. Your beginning to limit certain nutrients uptake. This is like less P uptake and that leaves you with more available K be used. I notice if you use high K concentrations. You can begin to mimic the cold "coloring" of a strain. It should be noted that this effect is expressed in strains more, that "can" or "do" color... Be careful with K supplementing. Stop any extra K at 2-3 weeks left. It can lower THC concentrations....Same with Mg use....

BUT, MMG is basically correct about air temp effects on plants! That's the expression your going to see... More pronounced in hybrid and Indica strains is my observation....Yet when it happens to Sativa's as he describes. I believe that's the plant looking for more warmth. ie; reaching for the light...Besides, it's always cooler the closer you get to the ground...Just observations mind you.

Dr. Who said:

You all should note that any Sativa or Sativa dominate strain. Tends to "like" a minimal temp drift at night. After all, they came from climates that only change about 4-8 deg F all year long. Much less day to night, being any "big" shift... Besides, it's the soil/media temp change that effects the growth more then air temps! The colder your media - under 65 - the more they slow and at under 60. Your beginning to limit certain nutrients uptake. This is like less P uptake and that leaves you with more available K be used. I notice if you use high K concentrations. You can begin to mimic the cold "coloring" of a strain. It should be noted that this effect is expressed in strains more, that "can" or "do" color... Be careful with K supplementing. Stop any extra K at 2-3 weeks left. It can lower THC concentrations....Same with Mg use....

BUT, MMG is basically correct about air temp effects on plants! That's the expression your going to see... More pronounced in hybrid and Indica strains is my observation....Yet when it happens to Sativa's as he describes. I believe that's the plant looking for more warmth. ie; reaching for the light...Besides, it's always cooler the closer you get to the ground...Just observations mind you.

Click to expand...

I believe that it is always the root temps causing the effect. I monitor canopy and intake temps at the floor. I never let the floor get below 66 farenheight and the circulation fans pretty much keep the whole room between there and 70 during lights off. And as stable at 76 canopy at lights on. 75-77 realistically.

I understand that if the room is cold and the roots are kept warm that the plants will be fine.

MichiganMedGrower said:

I believe that it is always the root temps causing the effect. I monitor canopy and intake temps at the floor. I never let the floor get below 66 farenheight and the circulation fans pretty much keep the whole room between there and 70 during lights off. And as stable at 76 canopy at lights on. 75-77 realistically.

I understand that if the room is cold and the roots are kept warm that the plants will be fine.

Click to expand...

BINGO that man!

Ok. I set the heater for the room.
Now running steady 77F
Night time temp 69-70F.

I was hoping to save some hydro
After all. I switched from 1000watts of hps/mh to 500watts of COBs to “beat the heat”. Guess I did it too good. Lol.

Probably be able to run threw the summer without ac. So that’s Kool

MichiganMedGrower said:

I believe that it is always the root temps causing the effect. I monitor canopy and intake temps at the floor. I never let the floor get below 66 farenheight and the circulation fans pretty much keep the whole room between there and 70 during lights off. And as stable at 76 canopy at lights on. 75-77 realistically.

I understand that if the room is cold and the roots are kept warm that the plants will be fine.

Click to expand...

Agree when i was "cold growing"
I used a aquarium heater in my res.
Although the air temps where mid sixtys

Plants where still happy

Bookush34 said:

Ok. I set the heater for the room.
Now running steady 77F
Night time temp 69-70F.

I was hoping to save some hydro
After all. I switched from 1000watts of hps/mh to 500watts of COBs to “beat the heat”. Guess I did it too good. Lol.

Probably be able to run threw the summer without ac. So that’s Kool

Click to expand...

Thats my plan man
Since im no longer in a cool basment

Im going to use my gavita in the winter
And make an led set up for summer