Temp and humidity in flower

[Hog_M@Gundy]

72 seems very cold to me, but I'm just an amateur. I have great results at low 80s lst. I wonder why he recommends so low? If one was using HPS bulbs, your room would have to be super cold to get those kid of LST.

I assume that temperature is sought due to terpene and cannabinoid preservation. Some terpenes start to evaporate off at temperatures low as 70°.

 

[American Hillbilly]

I assume that temperature is sought due to terpene and cannabinoid preservation. Some terpenes start to evaporate off at temperatures low as 70°.

So I guess my next question would be, for how long? Do you hold that cool of a temp for half of flower? The last 2 weeks? Or for the entirety of flower?

 

[SHRED]

A couple of sensors.
One high one low.

I am getting rid of the humidity in flower. Glad I installed it.

 

[harryowen]

It's all a big balancing act, because in the winter I have to humidify half way through, heat the entire time, and then dehumidify in the second half. If I ran my fan at the speed needed to extract humidity, I'd be sucking all my heat out.

Speed Test​

 

[BII]

At least theoretically, leaf surface temperatures will always be lower than air temp., with the leaves' constant evaporation/transpiration leading to constant cooling. So I'd be very cautious about maintaining leaf surface temp. say above 72-75˚F.

 

[American Hillbilly]

Leaf Surface Temperature with HPS, MH, CFL and LED Grow Lights

Effects of Different Artificial Grow Lighting Technologies on Leaf Surface Temperature Table of Contents Abstract FLIR Image of a BD240-U Introduction Why does Leaf Surface Temperature (LST) Matter? What is the Ideal Leaf Surface Temperature? What Affects Leaf Surface Temperature? The Evidence...

www.blackdogled.com

A worthwhile read, with some good links throughout it. What they have as far as examples with cannabis closely follows what I have seen personally with LEDS, addition of UV radiation, and HPS lighting.