Correct temperatures with leds
- Thread starter Skyhound
- Start date
Harvest76
Well-Known Member
There isnt 1 right answer. Some strains wont care, some will thrive, and some will suffer in too high or too low temps. Personally, I keep my tent in the mid-high 70s in veg, mid 70s in early flower, low-mid 70s and drop the temp about 10 degrees or so at night in late flower. In other words, try to mimic the natural outdoor temp cycle. I'm under LED and have not seen any ill effects. In fact, my current ladies are very happy with the arrangement. Just do what you're doing and as long as you're happy with the product, then it's fine. Happy growing!
NukaKola
Well-Known Member
80-85F. 85-88F if supplementing CO2.
It’s the leaf surface temp that matters.
HID lights produce lots of infrared and radiate heat downwards so the leaf surface temp is usually a few degrees hotter than the ambient air temp, which is why people run ~78F under HID lights.
LED’s radiate most of their heat upwards which is why you want higher ambient air temps to keep the leaf surface temps up.
It’s the leaf surface temp that matters.
HID lights produce lots of infrared and radiate heat downwards so the leaf surface temp is usually a few degrees hotter than the ambient air temp, which is why people run ~78F under HID lights.
LED’s radiate most of their heat upwards which is why you want higher ambient air temps to keep the leaf surface temps up.
Look up VPD charts.
Like said above. You don’t get the IR heat like you do with hps.
78F with hps you will see leaf temps in the 80-82F range.
With my COBS I have 83F room temp and my leaf temps are 79-80F
Really you need to match your leaf temp with your room humidity. (VPD chart)
If you have low humidity your magic temp will be lower. If your humidity is higher your ideal temp will be warmer.
Like said above. You don’t get the IR heat like you do with hps.
78F with hps you will see leaf temps in the 80-82F range.
With my COBS I have 83F room temp and my leaf temps are 79-80F
Really you need to match your leaf temp with your room humidity. (VPD chart)
If you have low humidity your magic temp will be lower. If your humidity is higher your ideal temp will be warmer.
Rocket Soul
Well-Known Member
It also matters how much intensity you give your plants, more intensity more heat. General advixe on white leds is font go below 81F.
Skyhound
Well-Known Member
can i have problems or less fat buds running on 75f white leds???
What
What was the humidity?
GBAUTO
Well-Known Member
What I've experienced is slower growth.
My room does best if I can keep the leaf temp @80degF.
Harvest76
Well-Known Member
Averaged 48% over the flower. Higher end at the beginning, kept it around 43% last 2 weeks.
Skyhound
Well-Known Member
the thing is that, the vpn charts points to even lower temps then 75f if i have humidity of 55%
Harvest76
Well-Known Member
I dont know what that means, explain it please. I've never seen a VPN chart. I grow by feel. Lol
Skyhound
Well-Known Member
its the chart the other guys recommend earlier in this post , if im reading it rightI dont know what that means, explain it please. I've never seen a VPN chart. I grow by feel. Lol
Skyhound
Well-Known Member
Could u take this doubts about vpd charts ?
Harvest76
Well-Known Member
It says I should keep my humidity at 65-70%? I dont think I could sleep at night. This has to be for veg only.
GBAUTO
Well-Known Member
VPD is a useful tool to help you adjust environmental conditions to allow the vascular system of the plant to get water/nutes from the roots to the leaves. I use this to try to adapt to ideal conditions. From what I've been able to research, photosynthesis peaks around 25-30 deg C, so starting at this temp and then adjusting the RH to get an acceptable vpd should give the best results.
I typically veg at 65%RH and rarely get the RH below 50% during flower. I have a ton of air movement in the room.
I typically veg at 65%RH and rarely get the RH below 50% during flower. I have a ton of air movement in the room.
Harvest76
Well-Known Member
Very interesting. I veg at higher rh too, usually low 60s. But try to keep in the 40s during late flower, except during lights out. I have a ton of air movement too. Maybe I'll experiment with higher numbers next time.
I live in a low humidity climate. And with wood heat in the winter. It’s like 17-20% RH
my grows were good. Went pretty smooth. Then when I stared paying attention to VPD. My growth rate increased noticeably. I have 6week plants at 4weeks now.
Everything appears excelorated. Plants also recover from topping and supercorppong faster for sure
my grows were good. Went pretty smooth. Then when I stared paying attention to VPD. My growth rate increased noticeably. I have 6week plants at 4weeks now.
Everything appears excelorated. Plants also recover from topping and supercorppong faster for sure
Rocket Soul
Well-Known Member
Yes. Or better yet depends on how much light youre giving uour plant. More intensity, more heat.
I do 24 c in hps and 26c peak in early flower for led.
At week 6 I drop it to about 23c to keep the buds dense. Week 8 or 9 you can drop down more to about 21c