Growing with LED in cold climate
- Thread starter KonopCh
- Start date
Hey I tried HID not saying anything about ur comment but problem is u still have to add a heat source when lights go out
I know exactly what you mean lol it requires a lot of trials and errors growing in climates where temperature gets to -30 . Growing WOES
Star Dog
Well-Known Member
Yes I'm afraid so, I'm needing a heater with the led light on, it's getting changed to hid today.
ballist
Well-Known Member
Took me a while but I also have the same problem plus fairly high humidity. The problem was lights off when the temp in the tent would fall to as low as 3 or 4 C . After a lot of trial and error with heating the room, I finally found a reasonable comprice of keeping the room around 20c and I was able to back off the LED light which had been much higher than required for 2 plants at 720watt. Temps nowdays areound 25c lights on and 20c lights off. Hoopefully this will help with the powdery mildrew that has also been my main problem to control. I have just started a new flower round on the 4th with the new temps so I should be able to tell you the outcome in around 8 weeks.
KonopCh
Well-Known Member
Maybe I didn't tell exactly what I want to ask...
I know about LEDs need higher temps than HID/HPS, I actually own DIY Samsung Q strips and have experience about it... But in almost perfect environment, so above 27°C, catching VPD, heaters, coolers, humifiders, etc...
I am asking if it's possible (and if plants can be healthy) to grow in 15°C with LEDs, if anyone did it in practice. I guess leaf temps would be at 10-12°C. And what's about feed then, if they transpire less than they would at 27-30°C. I guess feed has to be adjusted to lower temp. But again... can be done at those temps?
I know about LEDs need higher temps than HID/HPS, I actually own DIY Samsung Q strips and have experience about it... But in almost perfect environment, so above 27°C, catching VPD, heaters, coolers, humifiders, etc...
I am asking if it's possible (and if plants can be healthy) to grow in 15°C with LEDs, if anyone did it in practice. I guess leaf temps would be at 10-12°C. And what's about feed then, if they transpire less than they would at 27-30°C. I guess feed has to be adjusted to lower temp. But again... can be done at those temps?
Rocket Soul
Well-Known Member
Moflo has the best cold growing skills i know about, almost like voodoo... Do what he does
It helps to remember that heat is not only for transpiration and vpd is not the only thing that opens the stomata. Heating pad and a bit of extra blue/uv is the way. If you wanna make your life easier just use cmh though...
PopAndSonGrows
Well-Known Member
Why not just use HID lighting, and grow autos on 24/0 or 20/4?? No need for supplemental heat, temps will stay warm from the light. No fuss, no muss. A 315 watt CMH will slay a 3x3 space, same as about a 300 watt LED fixture.
PSUAGRO.
Well-Known Member
. Possible?yes, optimal? Absolutely not, few growers are able to like moflow with using the tips above. Like you already said watering habits, feed, needs to be adjusted drastically. You're walking a tight line to a lock if the root zone becomes water logged/cold.
I would suggest finding ways to raise the temps,hid,etc... instead of trying to push a decent run through the cold.
.. Rocket knows
Moflow
Well-Known Member
Definitely.
15 °c is ok for nighttime temperature but not day time when lights r on unless ur flowering ,it will be hard to veg @ that temperature .
ScaryGaryLed
Well-Known Member
yeah heat mats... or do what i do,.... liquid cool the leds and run that water into a container inside the tent or a reservoir under the plants, with a few vents, you might need to reinforce that if done underneath. if you have enough lighting you should be able to keep them warm and humid. then get a thermostat to regulate your exhaust fans. 200-300 watts of leds heat dumped into a 15 gallon tank should keep them about 70 degrees and 50% humidity. obviously you will have to top it off every so often. and if you are going to do this you can probably used cheap leds and make your own. as you will probably need the heat spare the lighting efficiency.