growing with hps on flowering above 28c / 82.5F will it reduce potency
- Thread starter Skyhound
- Start date
Skyhound
Well-Known Member
the only way i have is too put my leds , but im with fear of swaping stress ( week 4 flowering) because my leds are more potent in terms of ppfd , what woould u guys do ? change or go with hps and high temps
Rurumo
Well-Known Member
I wouldn't worry too much about it. I've grown some of the dankest outdoor plants during the summer when it was over 100 degrees for six weeks straight. The plants LOVED it and were just dripping resin and terps. If you see signs of heat damage on the leaves, sure, try to do something about that, but if the plants are doing well, don't worry. Fans can keep leaf temps down too as long as you don't blow them so hard they get wind burn. Think of all the traditional growers in Lebanan, Malawi, Central America, etc, 82 degrees is like a cool morning breeze to some of these folks.
Jjgrow420
Well-Known Member
I agree. Ambient temp vs leaf temp are diff.
My only issue is keeping dark period temps from getting down to 68. 83 to 68 not so good. So if you can keep night time temps a little closer it shouldn't affect them too much. Although Ive had greatest taste/flavour running about 78° day / 70° night even dipping it to 68° last 2 weeks
My only issue is keeping dark period temps from getting down to 68. 83 to 68 not so good. So if you can keep night time temps a little closer it shouldn't affect them too much. Although Ive had greatest taste/flavour running about 78° day / 70° night even dipping it to 68° last 2 weeks
hotrodharley
Well-Known Member
Keep plenty of air moving around them and go for it.
jimihendrix1
Well-Known Member
Mine stay that warm constantly, and never had a problem. Get huge yields. Mine are under 1000w Hortilux HPS and runs 82f-84f lights on. 72f-76f at night I do have good air flow, and 3 fans running 24/7.
Lucky Luke
Well-Known Member
Leaf temp of 27C is near perfect.
Yes high heat does burn terps and and will effect end product. Aroma first and foremost.
Outdoor plants are not inside ones. 40c outside producers lovely outdoor. 40C inside is trouble.
Yes high heat does burn terps and and will effect end product. Aroma first and foremost.
Outdoor plants are not inside ones. 40c outside producers lovely outdoor. 40C inside is trouble.
Nutty sKunK
Well-Known Member
Deffo. It’s all due to the roots and the ability to cool the plant down.
indoor 40c = 40c rootzone and they ain’t happy with that shit.
Star Dog
Well-Known Member
Do you mean at the canopy or the ambient temperature?
I use the back of my hand for lamp height and a thermostat for ambient temperature 25/26c the last time I measured the canopy with a thermometer it was 30c at the warmest giving me a leaf temp of 25/28c over the area with no problems.
I use the back of my hand for lamp height and a thermostat for ambient temperature 25/26c the last time I measured the canopy with a thermometer it was 30c at the warmest giving me a leaf temp of 25/28c over the area with no problems.
Skyhound
Well-Known Member
i meant the cannopy , but yesterday it reached 29C and i still have +-7 weeks and its only getting hotter each day , i need to change to the leds , hopefully i wont make my plants hermaphrodite
Star Dog
Well-Known Member
I hope it all goes well for you, idk for sure but I wouldn't expect them to hermie, is it any different to me changing from mh to hps after the stretch?i meant the cannopy , but yesterday it reached 29C and i still have +-7 weeks and its only getting hotter each day , i need to change to the leds , hopefully i wont make my plants hermaphrodite
Lucky Luke
Well-Known Member
Leaf temp will normally be about 3 C less than ambient. So far you have nuthing to worry about heat wise.i meant the cannopy , but yesterday it reached 29C and i still have +-7 weeks and its only getting hotter each day , i need to change to the leds , hopefully i wont make my plants hermaphrodite
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RacrX
Member
I only read a couple of the replies here and i can't say i agree with many.. people need to understand a few things when it comes to temperature. First its closely linked to intensity and humidity. If you are running at 83 with a high intensity and lower humidity, you can most definitely ruin a grow. Ive seen it. Teaching a buddy and he wouldnt spend the money to keep temps down so i let him learn. 83 84 whole flower, The bud looked good growing but straight airy hay when harvested. You really want to stay under 80. 75 is ideal. Outdoors the intensity is way down and humidity is usually up. the environment is natural and open and airy. A plant will be fine at higher temps outdoors than they can handle indoors.
RacrX
Member
you will have no issue changing to stronger lights just make sure they are the appropriate distance away. You may sacrifice some density switching away from hps. Get that heat down either way. Paramount. I can't say your bud WILL be total shit at 82 and 83 but the chance exists that it could be and it will definitely be worse quality all around at a higher temp. Is your ballast dimmable?
Skyhound
Well-Known Member
I made the change yesterday to LEDS , but the temp is a bit on the low side for leds , i can only get 72,5F , hope is not bad for my crop :S
You are going to want 80-82 to be ideal for leds. As your leaf temp will be 77-78
I have ran my led flower room at 76-75f in the winter and it did just fine.
Are you referring to led?Leaf temp will normally be about 3 C less than ambient. So far you have nuthing to worry about heat wise.
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With hps your going to see leaf temps higher then ambient temperature
Lucky Luke
Well-Known Member
OP stated he is growing with HPS.
I haven't flowered with LED but in veg my leaf temp is normally less than ambient when using LED
The article i posted uses Black Dog as a reference.
I think the take away from this is that leaf temp is usually different from ambient and is more important.