From a fellow grower: Where is the best place to locate my temp/humidity probe inside the grow tent? I have a 3 x 3 foot and have 400 watts of LED lighting, using the vivosun smart grow hub system to control the lights, duct, and circulation fan.
Lastly, I hear mention of “light leaks"I was wondering should the two bottom vents in my grow tent be left open to draw in fresh air to help control heat, and can this cause any light issues? The tent is a vivosun 3’x3’x6’. The vents are maybe 12” x 6" mesh openings that have a roll up Velcro cover, both at the two bottom sides.
I set my humidity probe at canopy level, light leaks can be detrimental for photo period plants during the hours of darkness during the flowering stage
Not disputing this, but my readings are higher above the canopy than below, for heat and RH. I have an intake fan on the bottom and an osc fan above the canopy, but always have higher readings above it.
I hang my probe center-tent at canopy height. I also cover it from direct light from the LEDs.
I use 3 hi med lo, not all spaces are created equal, not all move air the same.
Your grow is only as good as your weakiest link. I use mutiple thermometers. Now have 2 ph pens, both came with buffers, used them all for checking both pens after calibration. Im just an old guy who loves mother natures earth sciences. Old school. We manipulate mother nature in a grow space. 100s of grows work. Not all piped the same. Jim, the other day i mentioned cooler, observation as to temp in general. Cooler being key word, id wear a white t shirt out today in this 106 heat versus black t shirt. I appologize if you think i gave you wrong info.
Intuition suggests that humid air is heavier than dry air but, all other things being equal (temperature and pressure), it’s not. If you compare humid and dry air the moist air will have less mass (weigh less) than dry air. Additionally, warmer air, which tends to rise, will hold more humidity while cooler air, which tends to fall, will hold less. Taking humidity and temp readings high in a tent or similar grow room can have quite different readings than readings at ground or canopy level.
Cooling air will also allow moisture to gather onto surfaces (condensation) including leaves and flowers (think dew).
Long story short, humidity will show higher in warmer air high in the tent than in the cooler air lower in the tent. Humid air is lighter than dry air. It’s counter-intuitive but it’s true.
Intuition suggests that humid air is heavier than dry air but science shows it’s not. If you compare humid and dry air the moist air will have less mass than dry air. Additionally, warmer air, which tends to rise, will hold more humidity while cooler air, which tends to fall, will hold less. Taking humidity and temp readings high in a tent or similar grow room can have quite different readings than readings at ground or canopy level.
Cooling air will also allow moisture to gather onto surfaces (condensation) including leaves and flowers (think dew).
Long story short, humidity will show higher in warmer air high in the tent than in the cooler air lower in the tent. Humid air is lighter than dry air. It’s counter-intuitive but it’s true.
