Settle this please. temp needs for LED
- Thread starter Wizzlebiz
- Start date
Fishbulb
Well-Known Member
I'll try that thank you sir
rkymtnman
Well-Known Member
have you seen the foxtail too?
RadicalRoss
Well-Known Member
Here's the breakdown of averages from my recent grow.
I didn't mess with VPD at all, kept humidity around 40 for most of it and then dropped it near the end. I just chopped today and the tent is hanging up to dry. I'm a newer grower, but everything seemed to work pretty well to me.
eta: It's probably useful to say my average daytime temps are 82-85 and nighttime roughly 10 degrees lower, since that's not super apparent in the graph as presented.
I didn't mess with VPD at all, kept humidity around 40 for most of it and then dropped it near the end. I just chopped today and the tent is hanging up to dry. I'm a newer grower, but everything seemed to work pretty well to me.
eta: It's probably useful to say my average daytime temps are 82-85 and nighttime roughly 10 degrees lower, since that's not super apparent in the graph as presented.
Fishbulb
Well-Known Member
No but not super dense buds
This makes sense, as you know I have the SF-2000 and I couldn't understand why you kept dimming your light. I have my light at 100% after the 1st week, but this winter I had to get a humidifier to keep the humidity up, otherwise I was having issues.
This is almost certainly for hps
Kassiopeija
Well-Known Member
Source?
General knowledge and experience. All the top guys are running at 27ish. I have had far better results this run with higher temps and higher rh. Way more compact buds.
Attachments
Kassiopeija
Well-Known Member
this is exactly why I have posted these diagrams, as you can see better photosynthetic rates at higher temps.
But do not mistake them for VPD as rH isn't included.
BBQtoast
Well-Known Member
Neither is an analysis of leaf boundary layer resistance, if I pull air through my grow leaves can loose a lot more water than humidity can hold back.
If I plot boundary layer, air temperature and light I would have a graph that rh doesn't change much. If I plot heat and rh I can seem to play around more, one is not a good scale to use.
Star Dog
Well-Known Member
My experience with led is very limited but these are from around mid December, the ave temperature was 19/21c but got down to 16/17c during the frosty weather.
I had a few problems at the time which I put down to temperature but it turned out to be due to the led being to close, iirc this was 4/5 days after raising the light, although it was cold they were clearly responding positively.
I had a few problems at the time which I put down to temperature but it turned out to be due to the led being to close, iirc this was 4/5 days after raising the light, although it was cold they were clearly responding positively.
Imcamping86
Well-Known Member
I had kept my temps at 74f And my growth was slow . A user on this page informed me of a needed temp of mid 80s for led users . I made the adjustment and my plants took off .
all coco
Well-Known Member
Looks like the study was done with LED
(PDF) Photosynthetic response of Cannabis sativa L. to variations in photosynthetic photon flux densities, temperature and CO2 conditions
PDF | Effect of different photosynthetic photon flux densities (0, 500, 1000, 1500 and 2000 μmol m(-2)s(-1)), temperatures (20, 25, 30, 35 and 40 °C)... | Find, read and cite all the research you need on ResearchGate
www.researchgate.net
Moflow
Well-Known Member
Freezing, cold, optimum, roasting hot. Cannabis grows in all sorts of environments.
I'm not recommending growing in the cold, I'm just showing that it can be done.
My other flowering area temperature ranges from 16°C lights off building to a max of ~ 26°C with the lights on over a few hours.
I'm not recommending growing in the cold, I'm just showing that it can be done.
My other flowering area temperature ranges from 16°C lights off building to a max of ~ 26°C with the lights on over a few hours.
Attachments
bEelzeBosS
Well-Known Member
You guys are brave as hell pushing your flower rooms/tents in the upper 60's to 70's RH. If I did that especially late in flower my buds would be rotted all to hell unless I chopped them early. I keep my veg tent in the 60's and use a dehumidifier/inkbird to keep my flower tent between 45-55% RH.
twentyeight.threefive
Well-Known Member
I have four different autos under the same temps and conditions in the same tent. Running about 78-80F average. 2/4 are showing major foxtailing and are also the lowest plants from the light. The other two are great. Can only guess the foxtailing two are from poor genetics.
Severed Tongue
Well-Known Member
In a 3x3 with a MarsHydro TSW2000 (315 watts @100% from wall) and a single 8" clip on fan on the floor, my Temps are 30C and 60-70% RH with the tent closed.
Single plant, topped once and LST / cloned.
Seems quite happy.
I run a 4" inline fan for 10 min every hour sucks from bottom to top. 6 weeks in still no need for carbon filter (yet).
With the tent open and a 16" vortex style floor fan blowing in, Temps drop to 24C and 30-40 RH.
Single plant, topped once and LST / cloned.
Seems quite happy.
I run a 4" inline fan for 10 min every hour sucks from bottom to top. 6 weeks in still no need for carbon filter (yet).
With the tent open and a 16" vortex style floor fan blowing in, Temps drop to 24C and 30-40 RH.
You running co2? 30 seems high....