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UV light supplementation, Who's using it with noticeable results? Thread Tools Search this Thread
Old 07-16-2018, 12:06 AM #1
nxsov180db
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UV light supplementation, Who's using it with noticeable results?

Who's using UV with noticeable results? When do you introduce the UV into the grow? What on/off times are you using and do you change your timing as the grow progresses? How many 2' or 4' UV bulbs are you using for your size grow?
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Old 07-16-2018, 01:30 AM #2
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side by sides from what i remember back in the day did show marginal resin increase but it slightly reduced yeild due to the additional stress the plants experienced
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Old 07-16-2018, 01:40 AM #3
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If can you grow outside you won't have to supplement.
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Old 07-16-2018, 05:26 AM #4
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Skunkman says he never saw any positives from adding uv. I'll try to find u a link in the morning.
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Old 07-16-2018, 02:57 PM #5
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This is quote from sam_skunkman
Quote:
I ran a test a bit like this 20 years ago.
I had several different clones of high THC varieties, and industrial hemp, and a wild cannabis variety from the mountains.
I placed each clone in rows of five so they had a chance to be exposed to too high of levels, medium, and low levels, depending on the distance from the light sources.
To cut to the chase, no increase compared to controls without UV-B.
In fact the plants closest to the lights were a bit zapped and had lower plant weights and lower Cannabinoid levels.
(In my own opinion using organic soils to increase root mass, which gives Cannabis with improved terpene yield and better Cannabis yield is much better then UV-B supplement.)

Tonygreen,
As for On page 31 if you scroll down you get into some good stuff and an interesting hypothesis about thc. They quote Lydon and Pate, but Pate did my experiments with me
setting them up and measuring the UV-B levels, as well as testing the results on our GC.
He was unable to increase the THC levels. Lydon thinks CBD can be converted to THC, but most Cannabis grown in the west has no CBD to start with. Lydon also only dosed the plants with UV-B for only 40 days, part of those when the plant was still in veg. He also said no increase in THC in hemp plants so I guess CBD does not get converted to THC by UVB?
We tried several times, zero THC increase. I have never seen any lab results that showed an increase in THC from UVB exposure, I have never seen Lydon's work replicated, except when I tried but got no increase in THC.
As for "Marijuana Optics" anyone that reads it and thinks it is science needs to stop smoking so much.
Get all three of Lydon's papers and try to repeat the work, if I remember correctly he did not even use clones for the work, for sure in the case of Lydon's 1985 Thesis, I think the 1987 paper also. I will go find the papers and re-read them....
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Old 07-16-2018, 07:29 PM #6
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Wink

I can see Denali from my front window so when I did my UVB tests I started with the level calculated to be present at the top of the mountain.
The leaves were actually brown and shriveling by the second day.
Dropping the level down until the plants quit dying found no increase in THC production at all.

Between 50 uw (microwatts) and 200 uw the plants lost 3% to 20% of their yield.
Most plants left it at that, smaller and slower growth.

Some plants, while not increasing THC, delayed the onset of the high. And in addition, the high lasted longer. This happened more with select Sativa hybrids, although it is hit or miss because the breeding is done for THC levels rather than UVB sensitivity.

I use UVB from seedling to harvest, a couple weeks at the end never did make any difference, it is a whole life experience or the plant does not respond.

I like creeper weed and use 75-100 uw on all plants, the price is small. This is not enough for severe stunting but adequately creeperizes susceptible plants.

My current favorite is Obi-Wan, it sucks up UVB like a vacuum grabs popcorn.
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Old 08-17-2018, 09:21 AM #7
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Quote:
Originally Posted by Phaeton View Post
I can see Denali from my front window so when I did my UVB tests I started with the level calculated to be present at the top of the mountain.
The leaves were actually brown and shriveling by the second day.
Dropping the level down until the plants quit dying found no increase in THC production at all.

Between 50 uw (microwatts) and 200 uw the plants lost 3% to 20% of their yield.
Most plants left it at that, smaller and slower growth.

Some plants, while not increasing THC, delayed the onset of the high. And in addition, the high lasted longer. This happened more with select Sativa hybrids, although it is hit or miss because the breeding is done for THC levels rather than UVB sensitivity.

I use UVB from seedling to harvest, a couple weeks at the end never did make any difference, it is a whole life experience or the plant does not respond.

I like creeper weed and use 75-100 uw on all plants, the price is small. This is not enough for severe stunting but adequately creeperizes susceptible plants.

My current favorite is Obi-Wan, it sucks up UVB like a vacuum grabs popcorn.
Hello Phaeton,
I used a 4ft t5 uv bulb a few times. About 95µW/cm² according to the bulb.
No idea about thc levels, and didn't really notice any creepers.
But I noticed some heart palpitation weed in the uv batches that I didn't get in non uv batches, which I didn't care for.. any observations there?
Not a clone to clone comparison either, but same strains from same seeds.

How about fatter gland heads? I seriously didn't need a scope on a couple of those uv plants.
I switched the uv t5 to a red bloom bulb and moved it down, same cmh main lamp, and the nugs under the red really plumped and hardened a bit extra. I'll stick with that before uv again.
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Old 09-06-2018, 04:33 PM #8
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I USE UVB FLUO TUBEZ NOTICED SOME INCREASE IN TRICHS I THINK IS GOOD TO HAVE TO COMPLETE LIGHT SPECTRUM I CHANGE EM EVERY 4 YEARS AT START U HAVE TO PUT EM FAR AWAY CUZ THEY STRONG AFTER A FEW YEARZ THEY LESS STRONG. KEEP EM IN FLOWER ROOM ALL TIMEZ
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Old 09-06-2018, 06:12 PM #9
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Originally Posted by z00t View Post
I USE UVB FLUO TUBEZ NOTICED SOME INCREASE IN TRICHS I THINK IS GOOD TO HAVE TO COMPLETE LIGHT SPECTRUM I CHANGE EM EVERY 4 YEARS AT START U HAVE TO PUT EM FAR AWAY CUZ THEY STRONG AFTER A FEW YEARZ THEY LESS STRONG. KEEP EM IN FLOWER ROOM ALL TIMEZ

I'm curious how you tested for "more trichs"?
And...
What kind of trichs were there more of?


Non Glandular Cystolithic trichomes don't add oil value to the plant but they do block & disperse light.
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Old 10-30-2018, 09:13 PM #10
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Bump.

Anyone else has experience with using UV(B) during flowering? Did you notice any benefits?

Is it worth the investment?

I read so many conflicting opinions about additional UV lighting.
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