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Hello, I have a question about lighting. I currently have a Mars Hydro TS1000, but the temperature in my tent is around 30-31 degrees Celsius, so I plan to
BUZIMANstarted grow question 11h ago
Hello, I have a question about lighting. I currently have a Mars Hydro TS1000, but the temperature in my tent is around 30-31 degrees Celsius, so I plan to stick with 45W flat LED panels, which are of lower quality but allow me to have a temperature of 27.5 degrees. What the best
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00110001001001111Oanswered grow question 11h ago
if they are lower quality and produce less heat, you are probably sacrificing DLI which is more impatful than operating at 30-31C.
I'd rather have 'max' DLI relative to local variables and run a degree or 2 too hot than sacrifice DLI, but that's just an educated guess and no gaurantee it is better. Light and co2 considerations are pretty hard to outweigh... extreme heat could do it, but 30-31C isn't extreme. You are just barely going over what is ideal for maximizing photosynthesis, at least relative to temperature and ignoring other things.
31c .. crank RH up to 65% and that will mostly mitigate the heat and not overburden plant through excess transpiration. VPD is about leaf temperatures, and those are 1-2C lower than the atmosphere. A 1.4 kPa VPD results at 29C / 65% RH. That's a bit elevated but won't stall the plant.
exhaust otuside the area, and that will help. An evaporative cooler can reduce temps 2C i bet. this will also increase RH because a 'swamp' or evaporative cooler is realaly just a humidifier in action.. if you use one, make sure rh doesn't go too high.
Also, consider having lights on at night. You can make it overlap enough hours of your waking day to get things done without inconvenience and save a few degrees that way too.
i would try any and all options before reducing DLI provided.
Ultravioletanswered grow question 10h ago
30C Is 86F, not even necessarily too hot, it's riiiiiiiiiight on the precipice of too hot, so long as you can keep up with the watering, keep adequate ventilation all you will get is a plant that develops better suited to a hot and humid environment.
Facts:
The optimal leaf surface temperature (LST) for photosynthesis is generally around 28°C (82.4°F).
Cannabis plant transpires 3x rate at 86F as it does at 68F.
Transpiration, driven by Vapor Pressure Deficit (VPD), reduces leaf temperature. As plants transpire, water evaporates from their leaves, which has a cooling effect, similar to how sweat evaporates from skin. Higher VPD values indicate a greater difference in water vapor pressure between the leaf and the surrounding air, leading to increased transpiration and, consequently, more cooling. For this reason, when you calculate for VPD, you do so using the Leaf surface temperature (LST) and not ambient temperature, and the more transpiration that's happening, the more cooling the leaf will have internally. If you drop the temperature to 45-55 it will have a high rate of transpiration, that 86 will feel a lot more like 81F -82F, making it an optimal temperature for photosynthesis to occur within the leaf, just make sure water doesn't run out. 3x transpiration is 3x water use as 90% of a plants water usage during day is transpirational.
Knowledge. Best of luck.
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GoldenWeedGroweranswered grow question 11h ago
You should use an air cooler to refresh the external environment and keep the air flow circulation inside the tent on an adequate level in order to lower the temp inside.
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einamioanswered grow question 11h ago
Dude, just use TS1000 at a lower setting, put it closer to plants and use less power... I have the same light and whenever I turn it stronger than 50% my plants start frying, and it completely sufficient and energy saving, and doesnt get that warm, I would rather add more airflow for hot days and not use weak light.
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