Unlocking Cannabis’ Full Potential: The Case For and Against UV Scynce Led Light UV Cannabis Relation What is the true UV and Cannabis relation?

[Moe.Red]

Totally agree, I'm definitely more of an intuitive grower, but I understand a bit of the science too, probably more so since joining this forum honestly. My mom was a gardener, she made her own super soil before it was called that, didn't measure anything, let her intuition tell her how much, and I've had success doing the same... There really is a such thing as a green thumb. If her house plants were looking sad, she'd give them an aggressive haircut and feed them fish emulsion and they were glorious inside of a few weeks. There's a fine line between knowing the science and using it to your advantage, and trying to completely control a living thing. Sure many products are beneficial, but there is a such thing as too much. When I see someone post all thier goodies and it's like 20 different bottles and a strict schedule, it makes my head spin a little. I get that stuff is necessary in an inert medium... but that's why I do soil.
Not to sound like a feminist man hater or anything, because I'm definitely not, but I think a lot of men follow the old patriarchal beliefs, even subconsciously, that women can't possibly be as good at certain things as men... growing, being a chef, the medical field... which is silly because women have been the growers of food, makers of meals and birthers of babies for millennia. Damn fragile male ego, so easily threatened. So maybe that's another reason more women aren't here on the farm, they get sick of having thier skills questioned, having to prove themselves to men yet again, and being made to feel subpar because they happen to have a vagina... because that's a reality of life unfortunately, it was ingrained in society for centuries... I mean we just got the right to vote pretty recently and men are still making laws about our bodies. So maybe most just do thier own thing because they don't want to deal with it and don't need the validation as badly anyway. I'm here to learn personally, and there are plenty of cool guys on here that aren't condescending douchebags. That's the end of my rant lol... and I love men, I'm married to a pretty great one.

Rant anytime you want. I especially liked

...and trying to completely control a living thing.

We do tend to do that here. At least I have.

My wife and I are watching MASH in our down time. Holy crap, we have come a long way. The misogyny in that show is unbelievable. That was the norm then. Now I just drop the jaw that they were able to get away with it. Seems like every generation gets closer to parity tho, so we have hope.

 

[Harpua88]

Call me old fashioned, but I still believe it's near impossible to beat that flaming ball of hydrogen in the sky. I've always had a preference for outdoor... scratch that, good, properly grown outdoor... ever since hydro was the hot new thing everyone wanted when I was a teen and I thought they'd all lost their minds and thier taste buds because to me it tasted like chemical soup, made me paranoid and gave me a headache.
I agree with @Moe.Red being condescending gets you nowhere. I'm not a scientist, I don't know all the many terpenes and other things and all thier properties... but I still manage to grow pretty tasty nugs most years that tend to be well recieved by all that try them... with almost no fancy equipment save my low class lights for starting, some good nutes, a preventative spray, some good dirt... and the sun. It's become so much about the commercial side, trying to get you to buy shit to make your plants better, the art of it is getting lost, like @Harpua88 said. The plants tell you what they need if you pay attention. Maybe I'm just a hippie chick at heart.

Certainly nothing beats the sun.......we're getting close though. I don't know if we're able to beat the sun yet with artificial lights.....actually, they're all real.... ;)

What we can already do is beat the sun's time management.......zero cloudy days and for the most part, we go right to high noon, every single day. Are there other wavelengths and other kinds of energy that the sun produces that we can't yet? I don't know. If we could, would it even help? Does the sun add something to

We dig hippie chix!

I had a convo with @Kanashiihawk63 asking her why there are not more women on boards like this. She made some really good points not the least of which is women tend to be more intuitive about plants, less scientific. I’m sure I’m butchering this thought but basically dum boys argue about molecules and efficiency while she just quietly goes about growing beautiful plants while having no desire to know how osmosis works to push ions up the stalk.

There are other examples too like cannagranny who just have a feel for the plant but wouldn’t get into a debate about anything “Jeff” cares to talk about. I’ll bet she outgrows him 2 to 1 tho.

Sometimes we make it harder than it needs to be.

Women are smarter that's right...... ;)

And great points about approach. There's a couple of things we can cling to that can get in the way.........modern technology, and thinking that we can out-think, out-smart......we make the simple more complicated. Some things are getting better...... get a stronger light. Get better genetics. But by far, 9⁹

 

[AnimalHouse]

Prelude: This is my 4th grow using UV. 1st grow where I feel like I've done a good job applying it in regards to height above the whole garden and timing. Previous grows I could use it on half the crop because plants on one half were not so tall I could apply and not fear killing any plants.
To start, I'm following manufacturer instructions about how to use it.

One thing which I'm very close to counting as fact is spider mites hate UV and will avoid a UV lit plant like poison. As far as increase resin goes, I'm still in the "I have no evidence that says yes or no without doubt" category

I have no dog in the hunt as far as what lights to use. Reptile, LED manufactures, or any other source. I chose these because CLW sells them and I was already using CLW LED so it was a plug n play fit.

So here's what CLW says about how to use these lights they sell

And here's how I'm using them. They're installed on outriggers attached to the LED. They have a vertical adjustment of 1-2 inches and can rotate inward or outward for coverage. Mine are mounted at center height with a few degrees of outward projection. The UV are the blue lightsaber looking lights next to the LED blurple.
These lights are on a timer to switch on for 4 hours of the final hours of the lights 11.5 hour on cycle

A couple before and after shots. After all that's why you clicked on this post right?

before UV

9 days after introducing UV

The thing that's hard for me to pinpoint is that is it just simply ripening or is the UV really increasing resin? I'm kinda thinking a little of both. Is the change in color from the UV or is it just ripening of a purple strain? The leaves do seem to be a bit more leathery and tough from before UV was added.
I am happy these lights are not harming my plants and have considered maybe increasing on time these last two week of the grow.
Next week I'll post another comparison using today's after shot with a pic taken next week.
I also plan on injecting cold night air during lights out the final week which will also change up the colors of my garden, UV or no UV. So color isn't really a priority with the UV but potency most certainly is so that's what I'm mainly looking for.

 

[Moe.Red]

Prelude: This is my 4th grow using UV. 1st grow where I feel like I've done a good job applying it in regards to height above the whole garden and timing. Previous grows I could use it on half the crop because plants on one half were not so tall I could apply and not fear killing any plants.
To start, I'm following manufacturer instructions about how to use it.

One thing which I'm very close to counting as fact is spider mites hate UV and will avoid a UV lit plant like poison. As far as increase resin goes, I'm still in the "I have no evidence that says yes or no without doubt" category

I have no dog in the hunt as far as what lights to use. Reptile, LED manufactures, or any other source. I chose these because CLW sells them and I was already using CLW LED so it was a plug n play fit.

So here's what CLW says about how to use these lights they sell

View attachment 1317276


And here's how I'm using them. They're installed on outriggers attached to the LED. They have a vertical adjustment of 1-2 inches and can rotate inward or outward for coverage. Mine are mounted at center height with a few degrees of outward projection. The UV are the blue lightsaber looking lights next to the LED blurple.
These lights are on a timer to switch on for 4 hours of the final hours of the lights 11.5 hour on cycle

View attachment 1317277

A couple before and after shots. After all that's why you clicked on this post right?

before UV

View attachment 1317278

9 days after introducing UV

View attachment 1317281

The thing that's hard for me to pinpoint is that is it just simply ripening or is the UV really increasing resin? I'm kinda thinking a little of both. Is the change in color from the UV or is it just ripening of a purple strain? The leaves do seem to be a bit more leathery and tough from before UV was added. I am happy these lights are not harming my plants and have considered maybe increasing on time these last two week of the grow.
Next week I'll post another comparison using today's after shot with a pic taken next week. I also plan on injecting cold night air during lights out the final week which will also change up the colors of my garden, UV or no UV. So color isn't really a priority with the UV but potency most certainly is so that's what I'm mainly looking for.

Nice work man.

Your leaves appear to be tacoing under UVB. Mine did too.

Curious what your final take will be on this.

 

[steamroller]

Prelude: This is my 4th grow using UV. 1st grow where I feel like I've done a good job applying it in regards to height above the whole garden and timing. Previous grows I could use it on half the crop because plants on one half were not so tall I could apply and not fear killing any plants.
To start, I'm following manufacturer instructions about how to use it.

One thing which I'm very close to counting as fact is spider mites hate UV and will avoid a UV lit plant like poison. As far as increase resin goes, I'm still in the "I have no evidence that says yes or no without doubt" category

I have no dog in the hunt as far as what lights to use. Reptile, LED manufactures, or any other source. I chose these because CLW sells them and I was already using CLW LED so it was a plug n play fit.

So here's what CLW says about how to use these lights they sell

View attachment 1317276


And here's how I'm using them. They're installed on outriggers attached to the LED. They have a vertical adjustment of 1-2 inches and can rotate inward or outward for coverage. Mine are mounted at center height with a few degrees of outward projection. The UV are the blue lightsaber looking lights next to the LED blurple.
These lights are on a timer to switch on for 4 hours of the final hours of the lights 11.5 hour on cycle

View attachment 1317277

A couple before and after shots. After all that's why you clicked on this post right?

before UV

View attachment 1317278

9 days after introducing UV

View attachment 1317281

The thing that's hard for me to pinpoint is that is it just simply ripening or is the UV really increasing resin? I'm kinda thinking a little of both. Is the change in color from the UV or is it just ripening of a purple strain? The leaves do seem to be a bit more leathery and tough from before UV was added.
I am happy these lights are not harming my plants and have considered maybe increasing on time these last two week of the grow.
Next week I'll post another comparison using today's after shot with a pic taken next week.
I also plan on injecting cold night air during lights out the final week which will also change up the colors of my garden, UV or no UV. So color isn't really a priority with the UV but potency most certainly is so that's what I'm mainly looking for.

Very cool!
Thanks for sharing.
I'll be looking for next weeks pics.

 

[AnimalHouse]

Nice work man.

Your leaves appear to be tacoing under UVB. Mine did too.

Curious what your final take will be on this.

Thanks Man. I feel really good about what's happening but always skeptical. With user instructions being "suggestions" makes it really hard to to figure out exactly how to apply it. There's a learning curve there which only trial and error will be able to guide me.

 

[Harpua88]

Ye

Prelude: This is my 4th grow using UV. 1st grow where I feel like I've done a good job applying it in regards to height above the whole garden and timing. Previous grows I could use it on half the crop because plants on one half were not so tall I could apply and not fear killing any plants.
To start, I'm following manufacturer instructions about how to use it.

One thing which I'm very close to counting as fact is spider mites hate UV and will avoid a UV lit plant like poison. As far as increase resin goes, I'm still in the "I have no evidence that says yes or no without doubt" category

I have no dog in the hunt as far as what lights to use. Reptile, LED manufactures, or any other source. I chose these because CLW sells them and I was already using CLW LED so it was a plug n play fit.

So here's what CLW says about how to use these lights they sell

View attachment 1317276


And here's how I'm using them. They're installed on outriggers attached to the LED. They have a vertical adjustment of 1-2 inches and can rotate inward or outward for coverage. Mine are mounted at center height with a few degrees of outward projection. The UV are the blue lightsaber looking lights next to the LED blurple.
These lights are on a timer to switch on for 4 hours of the final hours of the lights 11.5 hour on cycle

View attachment 1317277

A couple before and after shots. After all that's why you clicked on this post right?

before UV

View attachment 1317278

9 days after introducing UV

View attachment 1317281

The thing that's hard for me to pinpoint is that is it just simply ripening or is the UV really increasing resin? I'm kinda thinking a little of both. Is the change in color from the UV or is it just ripening of a purple strain? The leaves do seem to be a bit more leathery and tough from before UV was added.
I am happy these lights are not harming my plants and have considered maybe increasing on time these last two week of the grow.
Next week I'll post another comparison using today's after shot with a pic taken next week.
I also plan on injecting cold night air during lights out the final week which will also change up the colors of my garden, UV or no UV. So color isn't really a priority with the UV but potency most certainly is so that's what I'm mainly looking for.

Yeah the only way to truly conclude that UV makes a difference (of course there going to look better after more time passes.....you could have sung to them and they'd look better.....).......but you'd have to get a very stable strain that was uniform in resin and THC production, and even that's really difficult........100 females of the most stable strain will still have variation in resin and THC......grow another 100 from the same exact seed stock with UV and it's still hard to say, they're still 100 different plants. And, everything else would have to be exa tky the same......

Regrow and reflower the same 100 plants? That might be better, at least it's the same exact plants. But to get true uniformity you'd have to take say, 100 cuttings from the same one female plant, divide them 50/50, and treat them exactly the same......except one batch of 50 with UV and the other 50 without. And of course, they would all need to be lab tested......

 

[Harpua88]

Nice work man.

Your leaves appear to be tacoing under UVB. Mine did too.

Curious what your final take will be on this.

Another thing I was surprised at......was how fast UV bulbs wear down, especially UVB. Like, 3 or 4 grows and that's it. So now we'd have to account for them getting weaker over time......or, replace the bulbs so often that it doesn't become a factor.

There has to be some at least mostly scientific study that really addresses this, if not already, then soon.

And yes, good job whether the UV helps or not..... ;)

 

[Harpua88]

Donnain,

There is no UV hype. The heated discussions are led by the uniformed. Attached is the original research article that defines UV and the effects on flavonoid, terpenoid and cannabinoid synthesis.

UV-B radiation effects on photosynthesis, growth and cannabinoid production of two Cannabis sativa chemotypes - PubMed

UV-B radiation effects on photosynthesis, growth and cannabinoid production of two Cannabis sativa chemotypes

pubmed.ncbi.nlm.nih.gov

Zill.

Looks like the first study was 1987? I'd have to read the whole thing, and I will, but I'd have to wonder how they added UV to a controlled study indoor grow 36 years ago......

Another study, listed below the first one, from 2022 claimed no differences with UV.

 

[Harpua88]

Donnain,

There is no UV hype. The heated discussions are led by the uniformed. Attached is the original research article that defines UV and the effects on flavonoid, terpenoid and cannabinoid synthesis.

UV-B radiation effects on photosynthesis, growth and cannabinoid production of two Cannabis sativa chemotypes - PubMed

UV-B radiation effects on photosynthesis, growth and cannabinoid production of two Cannabis sativa chemotypes

pubmed.ncbi.nlm.nih.gov

Zill.

I read the study......unless I'm missing something it seems like a summary. It doesn't say what they did, how, how they assured continuity, methods.....it's lacking to say the least.

 

[Moe.Red]

Ye

Yeah the only way to truly conclude that UV makes a difference (of course there going to look better after more time passes.....you could have sung to them and they'd look better.....).......but you'd have to get a very stable strain that was uniform in resin and THC production, and even that's really difficult........100 females of the most stable strain will still have variation in resin and THC......grow another 100 from the same exact seed stock with UV and it's still hard to say, they're still 100 different plants. And, everything else would have to be exa tky the same......

Regrow and reflower the same 100 plants? That might be better, at least it's the same exact plants. But to get true uniformity you'd have to take say, 100 cuttings from the same one female plant, divide them 50/50, and treat them exactly the same......except one batch of 50 with UV and the other 50 without. And of course, they would all need to be lab tested......

What I did was split one huge plant in half. Left side got UVB, right side did not. Still not perfect, the assumption there is that all UVR8 activity is local to the bud, node, whatever. I think it might be mostly true, but I still do not fully understand the exudates that could cause a plant wide change triggered from one spot.

 

[Zill]

Thanks. The materials and methods section is missing? I’ll check, maybe I sent the abridged non paying version.

 

[Harpua88]

What I did was split one huge plant in half. Left side got UVB, right side did not. Still not perfect, the assumption there is that all UVR8 activity is local to the bud, node, whatever. I think it might be mostly true, but I still do not fully understand the exudates that could cause a plant wide change triggered from one spot.

Yes, the problem with that...... and believe me, I want UV to help......we don't know if UV would affect only the side it shines on, or does it trigger something in the entire plant? You can tan only half your body.....but if you radiate half your body, your entire body will be affected.

 

[RootsRuler]

Anyone ever tell you that you are a condescending son of a Gun?

Maybe lighten up a bit and jump down off that horse of self proclaimed infinite knowledge and people will engage with you. I think you have some interesting points but I also have zero interest in exchange with you based on the tone of your posts.

Better check and see if this is the same IP address as Daggarooker!

 

[Zill]

Harpua,

I foind a copy of the entire article. I’m mailing you.

Zill.

 

[Moe.Red]

Yes, the problem with that...... and believe me, I want UV to help......we don't know if UV would affect only the side it shines on, or does it trigger something in the entire plant? You can tan only half your body.....but if you radiate half your body, your entire body will be affected.

Not sure your analogy holds there for a couple reasons. The vascular system in people is very different than plants. Plants don’t circulate like people. And yes if you pick up a radioactive sample in your left hand and hold it away from your body the effects are primarily in your hand. But again that’s not what we are talking about.

I don’t have a dog in this fight I don’t “want uv to work” any more than I want CO2 or nutrients to work. I just want to be clear on if it does. And by work I mean more cannabinoid molecules production across the plant if you count the number, primarily THC. Using that definition I do not think it does. For me it consistently produces less plant mass. Maybe as a percentage it might do a tiny bump, but I am not conceding that yet either. Not across the board.

As far as the less plant mass, scroll back a bit and look at the effects it has on the leaves. Turns them into tacos. I have witnessed this several times. There is no way those leaves can be more efficient than normal flat leaves. That is one of multiple morphological changes I have seen with uvb.

 

[Moe.Red]

Harpua,

I foind a copy of the entire article. I’m mailing you.

Zill.

Why would you not post it for everyone?

 

[mysticepipedon]

Why would you not post it for everyone?

Is this about the old Lydon article? You can download it here: https://www.plantgrower.org/uploads/6/5/5/4/65545169/274e9e6a286e8989e7825557ff49ce481759.pdf

 

[Moe.Red]

Is this about the old Lydon article? You can download it here: https://www.plantgrower.org/uploads/6/5/5/4/65545169/274e9e6a286e8989e7825557ff49ce481759.pdf

No, Zill has some super knowledge none of us mere mortals are privy to that hands down proves the efficacy of UV. Says so over and over with proof that is always just out of reach.

But thanks, Lyndon is one that is continually misrepresented on the forums. I wish Milson was still around, he had an incredibly funny way to look at the math and the people who misused it. Miss that dude.

 

[Moe.Red]

Here's one of Milson's hot takes on the gymnastics people do to stretch the math to make it suit their preconceived notions:

Quoting that report and misinterpreting the data has become a bro science forum wisdom stronghold for a long time.