The Impact of Light Intensity and Spectrum-Tuning on Cannabis Yields

a mongo frog

Well-Known Member
People seem to think COB and Board growers never used the sacred hps. We switched because they grow more and better herb.

More light per watt, superior spectrum and less heat and worry. Simple choice like radial tires or graphite rods or Goretex or contacts for sports.
So what happens when one can not control their grow room conditions with LED? If you follow the likes of @Or_Gro and his grow there is a heater involved to try to keep environment. Are we aloud to add the 1000 watts to his grow as actual wattage and efficiency talks like you did when you compared A/C with hps growers?
In all fairness you should stop acting like a dunce. You know for a fact you are not growing better bud because you are using Led lighting.
 

hillbill

Well-Known Member
That’s not true. In fact, the old Philips Mastercolor CMH grew herb I preferred over HPS bud. I do vent a little heat in when needed and running some HID would provide a decent amount of heat if needed, they always have.
This dunce spells that word a l l o w e d.
 

Or_Gro

Well-Known Member
So what happens when one can not control their grow room conditions with LED? If you follow the likes of @Or_Gro and his grow there is a heater involved to try to keep environment. Are we aloud to add the 1000 watts to his grow as actual wattage and efficiency talks like you did when you compared A/C with hps growers?
In all fairness you should stop acting like a dunce. You know for a fact you are not growing better bud because you are using Led lighting.
Who gives a flyin f about watts, lol?

plants use photons!

intensity & spectrum is what matters...

White leds’ll do it...

i supplement w a/c, heat, humidity/dehumidity, co2, uv, far red, whatever they seem to need to produce yields almost as good as this

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Or_Gro

Well-Known Member
Were you just joking or?
Yah mon!.......mostly

I don’t fight about lights anymore...

Too busy pressing all the bud they grow....
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You wanna see a fight? Mention that you love Kind leds...like i used to....and still do...just moved to a higher level...

That should get the hater’s undies in a bundle...

Lol

For any grower who thinks leds can’t do it....this is a plant by my gc bud tboneshuffle,
22oz of bud, in a 3 or 4 gal bucket....didn’t even pull the larf...

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After a certain point, it’s not the lights, it’s the grower...

(am i not right?)

But good lights are the single most important piece of equip, they can look cool, too

2DC3D3AF-5414-4F42-8428-027663D037A5.jpeg

And in the right hands, produce
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Btw, all the shit i do, is called - dialing it in...for my conditions...what makes us all the same, no matter the equip/process we use....

Think i’ll do another sweet, adult
490416D2-68C8-4E98-AA54-16DFD5EDE87A.jpeg
 
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hillbill

Well-Known Member
I used to love my original 357 Magnum with 14 or so bands and my generic little EBay blurple and my Original Blue Lumigrow and even my 300 watt Vipar(178w draw).

Still get great help from A51 white and red and white panels with Cree 5 watt diodes which are just pretty damn good.

I think though that over time the blurple light can cause the grower to become depressed and to lose motivation and muscle tone and body weight and eventually become afraid to leave the grow room.
 

Or_Gro

Well-Known Member
I used to love my original 357 Magnum with 14 or so bands and my generic little EBay blurple and my Original Blue Lumigrow and even my 300 watt Vipar(178w draw).

Still get great help from A51 white and red and white panels with Cree 5 watt diodes which are just pretty damn good.

I think though that over time the blurple light can cause the grower to become depressed and to lose motivation and muscle tone and body weight and eventually become afraid to leave the grow room.
And f’d up to no end...,
 

Or_Gro

Well-Known Member
Simple question .... what are those pendulums for ?
Always get that one...the girls use it for meditation b4 they put their leaves up to Jah, The Almighty!

I also used them for exact height and leveling the lights during mapping out the ppfd of the 8 288s of those timber 48sams (posted somewhere here) which occurred just before flipping those girls... left em in just in case they would be handy during first flower run...but found my light meters to be handier...
 

Budzbuddha

Well-Known Member
What no CRYSTAL PENDULUMS ? ... pray to Gaia kind of shit .... lol

No seriously thought they were distance points for canopy height.
 

Coalcat

Well-Known Member
I emailed the researcher guy to find out more info on the leds used in the study. He said they were all big brand leds except for the commercial led which were literally a led floodlight ordered from China. He didn’t want to publish the names because he didn’t want to discredit any specific led manufacturer. So take that extra info for what’s it worth.
 

Or_Gro

Well-Known Member
Lol I don't trust any of these companies tring to cash in on new tech in general. I've watched all this since 2008, everyone one of them has a lot to say and new numbers to back up their claims. I try to absorb all the info, and make educated decissions based on the actual science. I was around when everyone stopped talking about lumens, and it had to be par numbers, then it was ppf, now ppfd.

PPFD was switched to because ppf is mostly irrelevant, just like lumens. PPF doesn't speak at all for what the plants are actually seeing. PPFD is ppfd, average ppfd is called DLI. 1500ppfd for 12/12 is roughly 64.8 DLI. That is roughly where the sun is at and what we should all be shooting for.
Reading through this...jesus, lot of misinfo on both sides... tell me how much reef is grown outside where they have 65dli?

Lemme give you a hint where that is, it begins with phoenix, and ends with arizona...in the summer...

Take a look at primo outdoor reef country... norcal and soorg...thas the ticket, noeffingwhere near 1500ppfd!!!!

https://www.extension.purdue.edu/extmedia/HO/HO-238-W.pdf

One legit research paper concluded 1500ppfd was optimal photosynthesis for cannabis.....based on exposing leaves to 1500 ppfd....for 30mins!!!! Might be true for that duration....

Try doing 1500 on your plants for 12 hours....lol!

Edit: my error, leaves exposed 45-60 mins, not 30...same point, tho...

Here’s the study:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3550641/pdf/12298_2008_Article_27.pdf
 
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Or_Gro

Well-Known Member
Reading through this...jesus, lot of misinfo on both sides... tell me how much reef is grown outside where they have 65dli?

Lemme give you a hint where that is, it begins with phoenix, and ends with arizona...mud-day, summer...

Take a look at primo outdoor reef country... norcal and soorg...thas the ticket, noeffingwhere near 1500ppfd!!!!

https://www.extension.purdue.edu/extmedia/HO/HO-238-W.pdf

On legit research paper concluded 1500ppfd was optimal photosynthesis for cannabis.....based on exposing leaves to 1500 ppfd....for 30mins!!!! Might be true for that duration....

Try doing 1500 on your plants for 12 hours....lol!
Read page 16 of the fluence doc posted on the 1st page...
 

Thundercat

Well-Known Member
Reading through this...jesus, lot of misinfo on both sides... tell me how much reef is grown outside where they have 65dli?

Lemme give you a hint where that is, it begins with phoenix, and ends with arizona...in the summer...

Take a look at primo outdoor reef country... norcal and soorg...thas the ticket, noeffingwhere near 1500ppfd!!!!

https://www.extension.purdue.edu/extmedia/HO/HO-238-W.pdf

One legit research paper concluded 1500ppfd was optimal photosynthesis for cannabis.....based on exposing leaves to 1500 ppfd....for 30mins!!!! Might be true for that duration....

Try doing 1500 on your plants for 12 hours....lol!
Lol you seem annoyed for some reason.

First off I'm fully in support of LEDs, and pushing grow tech into the future.

Secondly I'd have to dig for them (which I'm not doing on my phone) but I've read several papers about the suns light intensity over the years. I had a chart at one point that was measured in New Zealand. The sun reached nearly 2k ppfd but that was at its peak it averaged closer to 1500.

Obviously like you point out above dialing in our grows is the goal that gives the greatest final results.

What intensity levels do you run at?

My point was only that the sun is our bench mark for lighting. If the other limiting factors like temp and CO2 are in check then there is no reason we can't push for high ppfd. Plants grow outdoors with full sun intensity really well ever day all over the world :).

No there aren't many places with a 60+ dli outdoors. I didn't say there was... I simply stated some average numbers based on data gathered in a test. It would seem that 40-50 is the average DLI during the growing season in the majority of the US. Which still puts us between 900-1100ish ppfd.

I really think it would awesome to create a timed dimmer so we could really replicate a day night cycle indoors. I think it would be awesome to start the plants day at a low level and ramp it up to peak levels and then. Taper it back down to night time. But that would be unnecessarily complicated I think.

So any way don't be mad at me because I suggested that we should all aim for the sun! I'm not here to fight or argue. I'm not discussing light types.

Hell this whole thread was originally about the importance of spectrum vs intensity. Would you like to weigh in on the OP?
 

Or_Gro

Well-Known Member
Lol you seem annoyed for some reason.

First off I'm fully in support of LEDs, and pushing grow tech into the future.

Secondly I'd have to dig for them (which I'm not doing on my phone) but I've read several papers about the suns light intensity over the years. I had a chart at one point that was measured in New Zealand. The sun reached nearly 2k ppfd but that was at its peak it averaged closer to 1500.

Obviously like you point out above dialing in our grows is the goal that gives the greatest final results.

What intensity levels do you run at?

My point was only that the sun is our bench mark for lighting. If the other limiting factors like temp and CO2 are in check then there is no reason we can't push for high ppfd. Plants grow outdoors with full sun intensity really well ever day all over the world :).

No there aren't many places with a 60+ dli outdoors. I didn't say there was... I simply stated some average numbers based on data gathered in a test. It would seem that 40-50 is the average DLI during the growing season in the majority of the US. Which still puts us between 900-1100ish ppfd.

I really think it would awesome to create a timed dimmer so we could really replicate a day night cycle indoors. I think it would be awesome to start the plants day at a low level and ramp it up to peak levels and then. Taper it back down to night time. But that would be unnecessarily complicated I think.

So any way don't be mad at me because I suggested that we should all aim for the sun! I'm not here to fight or argue. I'm not discussing light types.

Hell this whole thread was originally about the importance of spectrum vs intensity. Would you like to weigh in on the OP?
I recognize your support for led and other goodness, but i don’t appreciate misinformation!

You have repeated 1500ppfd several times. Have you ever grown at 1500ppfd? Have you ever even measured ppfd? I have, plants wither at that intensity!

@SMT69 posted recco’d ppfd and other variables for high intensity light growing on the first page of this thread, i referred to it above; you really interested? read it.

As for intensity & spectrum, yes both are critical for plant development, yield, & quality. You want my opinion, read my threads.

As for the op’s point, i couldn’t care less, i didn’t come here to read how photons from any source can be used to grow a weed. I already knew that.

Someone tagged me, and used me as an example for some ignorant point he was trying to make....i felt some obligation to see what led up to that...and found the same kinds of misinfo found in countless other such threads. Yours stood out as a good example for correction.
 

Thundercat

Well-Known Member
I recognize your support for led and other goodness, but i don’t appreciate misinformation!

You have repeated 1500ppfd several times. Have you ever grown at 1500ppfd? Have you ever even measured ppfd? I have, plants wither at that intensity!

@SMT69 posted recco’d ppfd and other variables for high intensity light growing on the first page of this thread, i referred to it above; you really interested? read it.

As for intensity & spectrum, yes both are critical for plant development, yield, & quality. You want my opinion, read my threads.

As for the op’s point, i couldn’t care less, i didn’t come here to read how photons from any source can be used to grow a weed. I already knew that.

Someone tagged me, and used me as an example for some ignorant point he was trying to make....i felt some obligation to see what led up to that...and found the same kinds of misinfo found in countless other such threads. Yours stood out as a good example for correction.
What I said wasn't really misinformation though. I stated an accurate number from a test result. I stated that as a number for the sun. And I said simply that the sun is our bench mark. I do appreciate the further info you've brought to the thread. Thanks for encouraging my research too. I did read that link from the beginning of the thread about high ppfd growing, I actually saved it for later use too :) I like to learn. Your plants look awesome and obviously your pulling yields.

I'm still not sure exactly why you seem so annoyed by and fixated on my comments that simply encouraged all is to maximize our potential in our gardens. But I still hope you have a great night and a green garden sir. I'm sorry that someone tagged you and bothered your night.
 

Or_Gro

Well-Known Member
What I said wasn't really misinformation though. I stated an accurate number from a test result. I stated that as a number for the sun. And I said simply that the sun is our bench mark. I do appreciate the further info you've brought to the thread. Thanks for encouraging my research too. I did read that link from the beginning of the thread about high ppfd growing, I actually saved it for later use too :) I like to learn. Your plants look awesome and obviously your pulling yields.

I'm still not sure exactly why you seem so annoyed by and fixated on my comments that simply encouraged all is to maximize our potential in our gardens. But I still hope you have a great night and a green garden sir. I'm sorry that someone tagged you and bothered your night.
You seem like a nice enuff guy. All the best to you.
 
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