Temps

Hell I can't afford an upgrade. lol. Sorry DailyBlastin I am drinking and having a little fun, no hard feelings. Word to the wise though, don't question Renfro here, he is the man. Thats why I did it.
 
Renfro said:
If using LED you want warmer canopy temps than with HPS due to the LED lacking infrared wavelength to warm the leaf surface temps. With LED I want canopy temps around 85F and with HPS more like 80F (those are with CO2 at 1000 - 1200 PPM).

If you let the roots get cold it will slow growth and limit yields. Cool night temperatures are a limiting factor as when the plants have warmer nights with ample water and they had ideal conditions during the day they will grow at night. What substitutes for light are the sugars the plant synthesised from the day before and stored specifically for use at night.

Also allowing night temps to drop will spike humidity levels and when your biomass hits a critical level you will likely end up with issues like powdery mildew.

If it were up to me I would do what is required to make sure the day canopy temps are good for my lighting and the night temps stay above 72F.
Click to expand...
Renfro if you did not use CO2 what temp would you want using LED lights?

In your experience is there ever a need for increasing humidity during flower? With good air circulation and exhaust are the VPD charts valid for flowering?

Thank you!
Cc
 
ComfortCreator said:
Renfro if you did not use CO2 what temp would you want using LED lights?

In your experience is there ever a need for increasing humidity during flower? With good air circulation and exhaust are the VPD charts valid for flowering?

Thank you!
Cc
Click to expand...

I don't use co2 and I keep my temps in the mid 80s

84.5 to be precise.

I stick to vpd chart until halfway through flower, then I begin lowering rh to decrease chances of bud rot or pm.

I'm not renfro, but half of what I write is shit he has beat into my head lol
 
ComfortCreator said:
Renfro if you did not use CO2 what temp would you want using LED lights?
Click to expand...
I would say mid 80's. I could probably run hotter but my LED tent isn't guaranteed CO2 levels as it's an environmental parasite.

IMO, VPD is a recipe for mold and mildew in later flower unless running resistant strains. Raising humidity in flower, yeah if you have really low RH%. I have been there. Still have my swamp coolers for early flower when the biomass isn't transpiring enough moisture to get the RH% up (very low ambient RH% here in Colorado).
 
yeah .. and i guess we have sometimes tendancie to use vpd in a bad way .. the leaf temp is what we have to look at, not the canopy temp .. and without a laser temp gun impossible to know the temp of the leaf
and indica dom strain IMO love a dryier vpd than equatorial/tropical sativa strain
 
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