LED light saturation nation

dank'd said:

it was the bugbee research team that did a video showing how in enclosed grow spaces using hid, thc and cbd makes a sharp decline at ambient 27C and up, the minimum temps that leds purport to require to sustain healthy cannabis

and powdery mildew is real where i live so that's another reason why i wouldn't dare growing indoors at such high temps and humidity

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I think your problem is dli, do you have a lux, ppfd, dli meter?

Every type of lighting has requirements. Just like each plant has its own requirements. If you don't have to make adjustments for any other type of lighting then obviously its best to use those in your grow. That doesn't somehow make LED worse of bad, just not ideal for YOUR grow environment.

Others have seen increases in quality and yields by making those adjustments to their grow to maximize success.

thisusernameisnottaken said:

I know what the problem is, and it's not vpd it's dli. Do you have a lux, ppfd, dli meter?

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i can't get the light dim enough to not still fry plants 8 months out of the year though

the hps is running brighter than the max i could keep the led at so that solves the problem for me

so ultimately it becomes vpd, as explained in this rollitup post

dank'd said:

i can't get the light dim enough to not still fry plants 8 months out of the year though

the hps is running brighter than the max i could keep the led at so that solves the problem for me

so ultimately it becomes vpd, as explained in this rollitup post

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I did a test with 1 day old seedlings I gave them 25-30k lux 18/6, and they reached for the light. Before I had alot of problems with led because i did not give them enough dli.

Have you seen this thread.
https://www.rollitup.org/t/seedlings-under-heavy-lighting-test.1074703/

thisusernameisnottaken said:

I did a test with 1 day old seedlings I gave them 25-30k lux 18/6, and they reached for the light. Before I had alot of problems with led because i did not give them enough dli.

Have you seen this thread.
https://www.rollitup.org/t/seedlings-under-heavy-lighting-test.1074703/

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I used to start all my seedlings and clones under 400w of CFL. They were only 12-15 inches from the bulbs and always did great, I wish I had a tester to be able to check levels. I usually had to rebury seedlings a little when I transplanted them because even at those levels they always reached for the light.

Thundercat said:

...Every type of lighting has requirements. Just like each plant That doesn't somehow make LED worse of bad, just not ideal for YOUR grow environment.

Others have seen increases in quality and yields by making those adjustments to their grow to maximize success.

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If I had to guess, I'd say the OP was using LEDs in a too cool environment, leaves started getting a little yellow so they douched it with extra fertilizer, nothing changed so they decided to change to HID lights, which probably warmed up the grow area, which corrected the original problem, that was not light but temperature.

Dispelling the myth that you can't grow cannabis in the cold with LED grow lights.

I've been growing with LED lights in cold temperatures for years.
It Can be done. Cannabis is a tough plant.
I've a 4ft x 4t tent out in the garage.
~ 370 watts of led, I'm using an HLG 550R dimmed down at the moment.
I'd Guestamate the temps as
Lights off Temperature ~ 12°C - 54 °F
Lights on Temperature ~ 17°C - 63 °F when it eventually heats up.
If I remember I'll stick a thermometer in there later.
Humidity ~ 90rh I'd guess. What is VPD anyway?
No heatmat or radiator in there.
I only use a heatmat when it gets even colder.
I've also small plants vegging in the attic that are as cold too.

I'm so jealous of you guys n girls with you're Optimum temperatures... lol
Enjoy.

Moflow said:

Dispelling the myth that you can't grow cannabis in the cold with LED grow lights.

I've been growing with LED lights in cold temperatures for years.
It Can be done. Cannabis is a tough plant.
I've a 4ft x 4t tent out in the garage.
~ 370 watts of led, I'm using an HLG 550R dimmed down at the moment.
I'd Guestamate the temps as
Lights off Temperature ~ 12°C - 54 °F
Lights on Temperature ~ 17°C - 63 °F when it eventually heats up.
If I remember I'll stick a thermometer in there later.
Humidity ~ 90rh I'd guess. What is VPD anyway?
No heatmat or radiator in there.
I only use a heatmat when it gets even colder.
I've also small plants vegging in the attic that are as cold too.
View attachment 5341123View attachment 5341125View attachment 5341127
I'm so jealous of you guys n girls with you're Optimum temperatures... lol
Enjoy.

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As I said before I think the problems are Dli not Vpd? I have also low temp and rh but my Dli is high.

thisusernameisnottaken said:

As I said before I think the problems are Dli not Vpd? I have also low temp and rh but my Dli is high.

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DLI in my 4 x 4 is ~ 43

yes it is true it is all about humidity, but i am not able to keep a stable 90% rh under any circumstances

@ charles i don't have any fertilizer it's already in the soil and this brand has always grown good plants under cfl, hid and sun. led, may through august only

quite literally the most expert growing decision i made in the last month was to switch to hid. corrected all problems in an instant

Moflow said:

DLI in my 4 x 4 is ~ 43

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I am at 25-30 Dli 18/6 week 3 from seed medium hot soil.

dank'd said:

yes it is true it is all about humidity, but i am not able to keep a stable 90% rh under any circumstances

@ charles i don't have any fertilizer it's already in the soil and this brand has always grown good plants under cfl, hid and sun. led, may through august only

quite literally the most expert growing decision i made in the last month was to switch to hid. corrected all problems in an instant

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What was your dli with led?

dank'd said:

yes it is true it is all about humidity, but i am not able to keep a stable 90% rh under any circumstances

@ charles i don't have any fertilizer it's already in the soil and this brand has always grown good plants under cfl, hid and sun. led, may through august only

quite literally the most expert growing decision i made in the last month was to switch to hid. corrected all problems in an instant

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You don't want 90% rh. A vpd of 0.80 to 1.20 is where you want to be. My rh rarely gets above 63%.

i came down with yield acquisition syndrome aka yas and had to try the led with the hps. just two bars on 15% dimmer mkay

dank'd said:

i came down with yield acquisition syndrome aka yas and had to try the led with the hps. just two bars on 15% dimmer mkay

View attachment 5341626

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Back in the dinosaur days, people would compare MH and HPS lights in the same area, hoping to prove that one light was superior over the other. Everybody knew that MH was better for vegging and HPS for flowering, so most people switched them out when they flipped to flowering.

With both lights on the plants, they found the plants in _between_ both lights, that received _both_ the MH and the HPS light overlap, did better than all of the other plants.

Goes to show you, it's all about the complete spectrum of light.

Moflow said:

Dispelling the myth that you can't grow cannabis in the cold with LED grow lights...
....I'm so jealous of you guys n girls with you're Optimum temperatures... lol
Enjoy.

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I'm right there with you! I've always felt that cannabis plants have to adapt to _my_ environment, not the other way around. I don't try to adapt or change the environment for some magic optimum temp and humidity for cannabis. The temp in the tents in the basement go from almost 90° and 85% humidity in the summer to 40° and 20% relative humidity in the winter. SouthEast Lights has gotten used to the wide variation and thrives in both environments.

I've never measured pH, EC, DLI, PAR, or any other value that people seem to get so worked up over these days. The only thing I monitor is temp and humidity, so I know how high to crank up the fans.

When you're only paying attention to all those scientific values, you're not observing the cannabis plant and what its trying to tell you.

the consensus on mh vs hps was hps produces better yield and mh better quality. mh buds are denser and frostier

my original intent when switching back to hid was to get an mh bulb for this light but just haven't checked into it yet. for some reason the mh version of this light is only available in the us but they do sell the bulbs also

even in that video a bit after the led and hid discussion the host asks him once and for all if he could only pick one type of light he said mh

possibly me adding this bit of led to the hps will have a similar effect as mh with more blues or something

wow 32c in a tent using hid will produce just about zero thc. even led would produce low thc at such high temps

conversely, 5c / 85+rh in a tent is a recipe for permanent grow tent pm

i have experienced both of these things so for now am just toning it down to well timed closet grows

dank'd said:

the consensus on mh vs hps was hps produces better yield and mh better quality. mh buds are denser and frostier...

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That would be an incorrect assessment of the consensus, back in the day, when this actually happened, from one who was there and took part in the experiments.

MH produced shorter, stouter plants, with more vegetation, while HPS produced taller, spindlier plants, with bigger buds.

Both lights produced equal _quality_ buds, although there was much discussion about MH lights producing more THC because of their UV wavelength.

I had a 1 kw MH lamp, in a 2x5 closet, so I knew light wasn't going to be an issue with my grow.

dank'd said:

wow 32c in a tent using hid will produce just about zero thc. even led would produce low thc at such high temps

conversely, 5c / 85+rh in a tent is a recipe for permanent grow tent pm

i have experienced both of these things so for now am just toning it down to well timed closet grows

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You are way to hung up on what you read about THC loss and temps. There is fire ass weed grown all across the world in temps over 90 degrees.

Charles U Farley said:

That would be an incorrect assessment of the consensus, back in the day, when this actually happened, from one who was there and took part in the experiments.

MH produced shorter, stouter plants, with more vegetation, while HPS produced taller, spindlier plants, with bigger buds.

Both lights produced equal _quality_ buds, although there was much discussion about MH lights producing more THC because of their UV wavelength.

I had a 1 kw MH lamp, in a 2x5 closet, so I knew light wasn't going to be an issue with my grow.

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close enough eh