AndromedaM31
Active Member
If I place my digital thermometer directly infront of my light will it read a higher temp than it really is?
Thermometer location?
- Thread starter AndromedaM31
- Start date
Yes it will. Keep it at canopy height and out of direct light.
Dr. Who
Well-Known Member
Yes
Location is key to a stepped temp range.
Pot level - mid to upper 60's
mid plant - lower 70's
canopy - upper 70's
Place the thermometer just below the canopy top and regulate to match as close to the list as you can. Some movement may be needed to adjust to those goals.
Location is key to a stepped temp range.
Pot level - mid to upper 60's
mid plant - lower 70's
canopy - upper 70's
Place the thermometer just below the canopy top and regulate to match as close to the list as you can. Some movement may be needed to adjust to those goals.
Kingrow1
Well-Known Member
Yes, it will read light radiation which will give false and higher readings than air temoerature.
You want the thermometer out of all light direct and in direct, this is the true way all science uses for air twmperature.
Heat is three things, conduction convection and radiation not one simple thing.
Temp sensors are not best placed in the canopy. There is far too much confusion here
AndromedaM31
Active Member
Theres just no way I can place it canopy height without it being in direct light, I'd have to put it just below the canopy hanging from the scrog board
AndromedaM31
Active Member
Think this location will be best?
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AndromedaM31
Active Member
Getting pretty frosty for only 2 weeks in flower
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Kingrow1
Well-Known Member
The problem comes when indirect or direct radiation makes folks thing hps is hot or makes em blast extraction in some effort to cool but really you end up making a wind tunnel.
Reading exact air temp is much harder than you think, mainly it will be close to the air outside the tent.
It is quite the discipline to get this stuff all right
Reading exact air temp is much harder than you think, mainly it will be close to the air outside the tent.
It is quite the discipline to get this stuff all right
AndromedaM31
Active Member
Man it was reading at 82 where It was before infront of the light, and now its reading 73 where its hanging below the scrog board. Using infrared thermometer the canopy reads between 74-77
Sound about right?where its located Should I expect it to read a little less than it really is up above?
Sound about right?where its located Should I expect it to read a little less than it really is up above?
AndromedaM31
Active Member
Lol you're right, it's starting to confuse me a bit.
What should I have it reading right where it's at to be the proper temp? Atleast an approximate reading
Kingrow1
Well-Known Member
Infared thermometers are for vpd equations and not air temperature readings as far as i know unless they have one which somehow reads the air and not the surface of the leaf or whatever its aimed at.
Now shade your thermometer and place away from the light.
You see why some stop using them altogether and just read the plants, i now my tent never exceeds max temps so i dont use one these days.
keep at it youll suss it
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