Indoor Placing your temperature probe

[The Medicine Man]

Hey all,

Where do you place your temperature probe in your room? Right at the tops of the plants facing the light? Or somewhere else? I measured the outdoors temps with full sun, the probe facing the sun, and it was well over 100 degrees. But the temp reading in the air was just 77. I didn't know how some of you folks are placing your sensors & would love to hear. I've read it in the direct path of my 1000w and it can read over 90, facing the light. Plants are doing fine & all.

 

[namvet25]

The thermometer or probe should be as close to the top of the plants as you can get.The temps outside should be taken in the shade which will give you the correct temp.

 

[Muddy]

I've got mine mounted on the side wall, about 30" above the floor. Given about 8" height for the pots that puts it right about at the top of the plants once they are finished vegging.

 

[The Medicine Man]

Are the probes, though, facing directly into the light? Or are they more taking ambient temps at the level of the plant tops?

 

[Gandolph420]

I just hang mine from the top cross bar, and raise and lower it with the canopy.

 

[Gandolph420]

I keep mine an inch under the canopy to keep out of direct light, the radiant heat will effect your reading, you want the ambient temperature of the room.

 

[GoTgReEn]

I place mine just above the lamp so no radient heat get it for ambient temp. And one on side wall same right as canopy

 

[The Medicine Man]

Cool, thanks all!!

 

[gtron]

I place mine at the top of where my pots are.
The temp of the root zone is way more important than the temp around the leaves. (within reason of course)
If the root zone gets to hot, your plants are have trouble.
If the root zone temp stays out of extremes the plant can do OK in fairly hot air via respiration (assuming it is healthy and has enough water).
I learned this the hard way last year with my vegetables. I put them in 5g containers with most of them on shelves 4' above the ground to keep them out of the reach of one of our dogs.
The difference in the soil temp of the root zones for the container plants on the shelves and the ones on the ground was at least 15 degrees and sometimes much more than that.
The plants on the shelves with a root zone temp frequently in the 90's just would not thrive, whereas the plants on the ground with a root zone temp in the upper 70's to low 80's did ok.

 

[brokencage]

I keep mine an inch under the canopy to keep out of direct light, the radiant heat will effect your reading, you want the ambient temperature of the room.

same here.