How To Measure Tent Temp?

Discussion in 'Grow Room Design/Setup' started by Ciarán69, Jun 18, 2019.

  1. I've been wondering how to measure the temp in your tent. If I put my meter nearer the cfl & below my led the temp goes up to 28.9 degrees...obviously! :)
    If I move it to the other side of my tent away from the cfl & under the led its about 26.8 degrees.

    So whats my tent temp?

    Is it ok to have a part of your tent this warm?

    My tent is 2x2ft

    Nearer CFL 2.jpg Nearer CFL.jpg Further Away.jpg
  2. Canopy level is the important one
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    • Agree Agree x 1
  3. Turn on your fan, and those numbers should homogenize some.
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  4. Thanks to both of you for taking the time to reply!
    Even with the fan blowing on the meter/canopy, it still reads 28.9ish. Im wondering more about the hot spot in the tent as opposed to the canopy temp.
  5. Canopy temp means more to your plant. The reason for the hotspot is due to being between both lightsources. The hotspot shouldn't be too big of a worry. Keep your fan running, and homogenize the space, then worry about bringing down your whole tents temp when needed.
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  6. Thanks for the reply. I was worried about the hot spot. It's summer here so temps are up & I'm running the lights at night. I've been thinking about putting a 5L bottle of frozen water into the tent. Not sure how much that will help.
  7. Not much. What does your ventilation look like?
  8. If you're sitting at 84 f, I say you're good anyways (sorry had to convert from C lol. GC you should make an autoedit for us Americans, we can be a bit slow.)

    Let her ride, and watch for deficiencies. If you're below 85 (in summer) your whole grow, you're good. IMO. Throw her some photosynthesis plus.
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  9. I'll keep an eye on her. Again, I appreciate you taking the time to help!.
  10. F5D5518C-19CE-4E84-81E0-71A78CCA3C58.jpeg 5D8479FF-31F4-49D9-B29A-75F14A15268C.jpeg 6A73B290-CFFA-4DBB-B375-CC1B9C738D5E.jpeg Leaf surface temperatures are much more important than ambient air temperatures. Ambient in my tent can be up to 95f on a hot hot night, but if top canopy leaf temps are down to 80-85 due to the fans, adjustment isn’t necessary.

    I have grown outdoor for years now. Where I am, summer temps exceed 100f 5-7 days a week from early June to early September, and reach 110f+ about 30 days during that time. It is a dry heat, with less than 30% RH during most summer days. Outdoor growers in my climate have long known that high ambient temps will not hamper growth UNLESS high leaf temps accompany it. Timed misters and shade cloth have been used for decades, not to drop ambient temps, but to drop leaf surface temps. Tired and wilted outdoor plants will begin to show when leaf temps are over 90f for a couple hours with no temporary relief. Same goes for my tent; plants don’t show heat stress until several hours of leaf temps over 90.

    Just went out and snapped some pictures. 106 ambient temp, 120 soil temp near the plant (the plant is on a stool), but leaf temp is spot on, and it is as happy as a clam. This is an autoflower that began flowering in about 3 weeks. It’s less than a foot tall and loving the sun despite the heat.

    Do yourself a favor and get an IR temp gun and begin to track your leaf surface temps, along with ambient. You will realize that ambient is less important that most people think.
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  11. 9F2060C6-05F5-40F8-ACD8-40394AEBFF57.jpeg 1BF9F3EE-54C4-4E65-B438-7F030DCDA051.jpeg DA9820CE-F49D-4229-9605-083A8287CC58.jpeg 2.5 hours later, still happy. Ambient in that area of the yard is 104, soil near it still around 120, leaf temps down 1 degree due to the breeze right now.

    Leaf temps>ambient fellas.

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