Makeminefullgrown
Well-Known Member
I know the answer but I can screw things up pretty good if given the chance…..so I’ll ask you folks.
I have 3 plants in a 2.5’x6’ closet with 8’ ceiling.
My light is an HLG 320 xl r-spec LED, hanging about 22” above the canopy. I bought one of those laser thermometers to check my leaves. I also have a couple other temp/humidity gauges in the closet. No matter what I do the laser always reads about 2F degrees above the ambient temps.
Right now for instance, I have 3 different thermometers in the closet that all read between 75.2 and 75.7F……so I feel like all 3 cannot be wrong. When I shoot the red dot onto one of the top leaves it’s reading 77.0-77.6F.
My understanding was w/ an LED the leaf surface temps will always be a couple degrees cooler than the air…..but mine says otherwise.
I’m guessing and hoping that the laser thermometer is off and needs to be calibrated, which cannot be done with this model.
Am I safe to assume that a 75F air temp will result in leaf temps of approximately 73F?
What’s the deal?
I’ve tried for the ideal VPD throughout the grow and just went off the air temp and subtracted 2 degrees but I figured I would ask about the chance of that reasoning being flawed.
It seems to be working I guess, as I’m in week 12+ of my light flip to 12/12 and the plants seem fine and should be ready in a week or two…..one actually has already been harvested so I’m down to 2….but I digress.
thanks for chiming in.
L
I have 3 plants in a 2.5’x6’ closet with 8’ ceiling.
My light is an HLG 320 xl r-spec LED, hanging about 22” above the canopy. I bought one of those laser thermometers to check my leaves. I also have a couple other temp/humidity gauges in the closet. No matter what I do the laser always reads about 2F degrees above the ambient temps.
Right now for instance, I have 3 different thermometers in the closet that all read between 75.2 and 75.7F……so I feel like all 3 cannot be wrong. When I shoot the red dot onto one of the top leaves it’s reading 77.0-77.6F.
My understanding was w/ an LED the leaf surface temps will always be a couple degrees cooler than the air…..but mine says otherwise.
I’m guessing and hoping that the laser thermometer is off and needs to be calibrated, which cannot be done with this model.
Am I safe to assume that a 75F air temp will result in leaf temps of approximately 73F?
What’s the deal?
I’ve tried for the ideal VPD throughout the grow and just went off the air temp and subtracted 2 degrees but I figured I would ask about the chance of that reasoning being flawed.
It seems to be working I guess, as I’m in week 12+ of my light flip to 12/12 and the plants seem fine and should be ready in a week or two…..one actually has already been harvested so I’m down to 2….but I digress.
thanks for chiming in.
L