Grow Temperatures VPD Chart Question

[oldsmokey]

Remember they are talking about leaf temperature

 

[Mike80]

I should get infrared thermometer. I did a bit more research and found this. It’s their recommend room temperature for plants with their chart

 

[Rosti]

Remember they are talking about leaf temperature

Yes that’s why I said core leaf temp is usually 2-3 degrees cooler then the ambient room temp, why I suggested 75-78 degrees ambient room temp, then core leaf temp should be the optimal VPD with 65% humidity. Also recommended him to get the IR thermometer to be 100% sure.

Your numbers match my chart for 65% humidity. I’ll increase the temperature to about 78 F and put humidity at 65%. Do you drop the humidity for the plants on a weekly bases?

No, I leave it the same until I’m ready for flower then I lower to 55% and down to 45% towards the end of flower when buds get bigger.

 

[Buds Buddy]

Since it seems like you're trying to get the perfect environment .... Have you checked your lights for Lux or PAR at the canopy ? You'll need that correct in order to get correct leaf temp as the closer or farther your lights are to the canopy will change those temps.
I start out at 50,000 Lux & work my way up to 70,000 Lux as the plant matures.

 

[Mike80]

Yes that’s why I said core leaf temp is usually 2-3 degrees cooler then the ambient room temp, why I suggested 75-78 degrees ambient room temp, then core leaf temp should be the optimal VPD with 65% humidity. Also recommended him to get the IR thermometer to be 100% sure.



No, I leave it the same until I’m ready for flower then I lower to 55% and down to 45% towards the end of flower when buds get bigger.

I increased my humidity to 65% and temperature to 78 F. Let’s see how the plants respond to this. How do you guys feel about watering before turning off the light for 6 hours. I’m noticing some of soil still damp after 6 hours.

 

[Mike80]

Since it seems like you're trying to get the perfect environment .... Have you checked your lights for Lux or PAR at the canopy ? You'll need that correct in order to get correct leaf temp as the closer or farther your lights are to the canopy will change those temps.
I start out at 50,000 Lux & work my way up to 70,000 Lux as the plant matures.

Hey ,

I have my light at about 24" above the canopy. I’m Keeping it at the closest distance I can because I got tricked with my light. Was advertised as 1200 Watts when the actual is about 150-200 Watts.

 

[Cmoneywills]

I agree, seedlings prefer a bit higher temptrature and humidity. 60-70% humidity, 75-79 F

 

[Cmoneywills]

I agree, i would have my seedlings at 60-70% humidity and 75-78 F