Correct temperatures with leds

[Have2]

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.

And what would be the leaf temp if the room temp is 85-88?

My leag temp is 70-72 and room temp was 81-82... :/

 

[GBAUTO]

And what would be the leaf temp if the room temp is 85-88?

My leag temp is 70-72 and room temp was 81-82... :/

I typically see a 79-80 degF leaf surface with a room temp of 83.

 

[NukaKola]

And what would be the leaf temp if the room temp is 85-88?

My leag temp is 70-72 and room temp was 81-82... :/

Yeah not sure why your leaf temps would be so low. My leaf temps are usually only a few degrees lower than my ambient temps.

 

[Have2]

Yeah not sure why your leaf temps would be so low. My leaf temps are usually only a few degrees lower than my ambient temps.

Are you in soil or hydro? I'm in hydro, water temp at 68, maybe the reason? Just took few more readings... LST at 73, ambient temp 82. Will try to raise ambient temp a bit and see how it goes.

 

[PJ Diaz]

Are you in soil or hydro? I'm in hydro, water temp at 68, maybe the reason? Just took few more readings... LST at 73, ambient temp 82. Will try to raise ambient temp a bit and see how it goes.

Low humidity? Perhaps the stomata aren't opening enough for ideal transpiration.

 

[Have2]

Low humidity? Perhaps the stomata aren't opening enough for ideal transpiration.

60-65%... I'm really puzzled.

 

[Red Eyed]

60-65%... I'm really puzzled.

Have a fan on really high?

 

[Have2]

Have a fan on really high?

I'm not ventilating right at the canopy and fans are set to minimum flow (1).