Heat + LEDs = DEATH

Senseimilla

Well-Known Member
I had a little situation this morning. It got cold overnight and I went and turned the heater on, not thinking about my enclosed grow room that gets the majority of the hot/cold air... it was only closed with the heat on for a little over half an hour after lights up before I woke up and realized 'hey, i better shut the heat off and open that door'.... well there was a lot of leaf cupping and twisting from the heat.... but most everything directly under an LED got bleached/toasted. I guess if anything this proves that the LED really is putting out a shit load of energy for the plant to process compared to HPS. They could not handle the lighting at high room temps.My lesson - #1: watch that heat like a mofo. I've not had issues in the 85-90 range... but over 90, you're gonna kill your plants under LEDs much worse than HPS if the lights are close. I'm guessing it probably got into the upper 90s or around 100, and the air blowing in was probably over 100 (even though a/c was only set to 72) -- lesson #2 -- add extra co2 :)
 

dolamic

Well-Known Member
I let my temps drop at night and don't worry about it too much. I only have about a 15 degree drop in night to day. Doesn't hurt them, doesn't bother me. I let my fans blow over my LED's during the daytime and keep them as cool as possible. Temps run as high as 83-85, low as 63-65 at night. With about a 5 degree variance.
 

stardustsailor

Well-Known Member
Probably because...
Plants that they are not used in high temps,they do not tolerate high temps.
Not great heat & water evaporation management mechanisms ,there..
....
 

Senseimilla

Well-Known Member
You guys aren't getting my point. It's an HPS + LED room. The plants under HPS or not right under the LED had at worst some leaf twisting/cupping. The canopy area directly under the LEDs got fried in < 1 hour. This is not something I'm saying to scare people, just to let you know to REALLY watch those temps... and to maybe explain why some people have issues growing with LEDs. I'm trying to spare someone else the same problem - not asking for an explanation.
 

Senseimilla

Well-Known Member
I have been thinking about it and where the plants got the worst of it and where they didn't and I think it's as much of an airflow issue as heat.. the areas of plants that had good airflow did not get fried it seems. the plant that got hit worst had no direct air (only indirect... the parts that had the indirect air had little or no problems it seems).
 
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