Reptile lights, LED with UV

VegasWinner said:

Uvb creates Suntan and sunburn, forms of stress. You can pinch your stalks for free and get the same result. Peace

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Nope. U R wrong.
UVA & B increase quality.

But you're right about the sunburn...

Evil-Mobo said:

Yup I ordered 2 4 foot bulbs and single bulb fixtures from HTG

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Exactly what I plan. $100ish?

captainmorgan said:

Like anything too much can be bad. I would start with a single bulb at 18" for 1 hour and build it up to 4 or 5 hrs watching for signs of stress and if everything looks good add the second bulb and do the same. That may be more than you need in a 2x4 and only need one,I haven't tried the Pures yet.

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people have said its better to start em young with the uv as compared to blasting them during flowering, as they build up a tolerance and dont get too much 'negative' stress

captainmorgan said:

Even coverage would be best if it will work with your light,they also make 2 footers if that helps.

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the CF-style reptisun bulbs are 13 watters on ebay for $11 and are super money for smaller/odd shaped grows. and you'll have a mogul socket you can swap out with an A19 LED (feit, philips, brightstik, etc) for different utility of supplemental light

BOBBY_G said:

people have said its better to start em young with the uv as compared to blasting them during flowering, as they build up a tolerance and dont get too much 'negative' stress

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My guess is it would be strain dependent on how much it stresses a plant. I've never seen any UV related stress on any of my strains but I run only stable and durable strains and cull anything sensitive or finicky.

ive seen em burn when i used to run CLW solarstorm 880s and flip UV on at 4 weeks. looked like nute burn on the edges. cant wait for your results cap'n, was everythign else pretty standard conditions from crop to crop?

Chunky Stool said:

Nope. U R wrong.
UVA & B increase quality.

But you're right about the sunburn...

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It’s well-established that UV light in all forms can damage plant tissues. UVB rays specifically damage proteins and nucleic acids in the cells, which harms cell reproduction and plant metabolism.

Cannabis plants respond to this stress by increasing production of trichomes (which biosynthesize cannabinoids). Trichomes help the plant reflect light in an effort to protect the plant’s flowers from damaging UV light.

So, understandably, some cannabis growers are seeking lighting sources that emit UV in an attempt to produce plants with more THC-containing resin.

However, LEDs that emit light in the UV range can be extremely inefficient, burning considerable energy (and dollars to generate that electricity) for negligible gain. Additionally, UV LEDs are expensive to produce and tend to have a shorter lifespan than other LEDs in the visible light region of the electromagnetic spectrum.

Growers might instead want to explore ways of inducing stress in cannabis that does not rely on the use of inefficient and expensive UV-emitting grow lights.

Every grower, it seems, has his or her own method for inducing stress to increase trichome production. Treatments can be strain specific, so research and practice may be required to find the best method for your particular strain. Additionally, while data is thin on the efficacy of some of these methods, growers swear by these mechanisms to induce stress. Following are some approaches to try, all of which should be executed in late flowering before harvest:

• Careful rolling of a branch just beneath bud sites will cause a cavitation in the transport system signaling the plant to direct resources to the injury. As the hormones and nutrients are sent to the injury, they end up in the actively growing ends of the branch, flower buds, where potency and yield increases.
• Drop nighttime temperatures in your grow room to make plants think winter is approaching; they’ll go into overdrive and produce more trichomes.
• Conversely, induce stress by raising temperatures; use caution, though, as heat stress can form elongated, wispy flowers.
• Lower humidity to 15% at the end of flowering cycle.
• Decrease photoperiod or even turn lights off for 2-3 days prior to harvest.
• Use ice water for final flushing of plants.

https://www.illumitex.com/do-your-cannabis-plants-need-uv-light/

seems that there is a concensus about what causes stress in MMJ plants. peace.

Been doin it for years, I even use UV on seedlings, there is zero stress if done right and the coolest thing you will ever see is to have an 8 bulb T5 veg light with one UV bulb in it and put 20 seedlings under it, within a few days they will all, yeppers every one, grow towards the UV bulb, They freakin love it

a two week old seedling for your viewing pleasure
.

BOBBY_G said:

ive seen em burn when i used to run CLW solarstorm 880s and flip UV on at 4 weeks. looked like nute burn on the edges. cant wait for your results cap'n, was everythign else pretty standard conditions from crop to crop?

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Last test was done less than a year ago so it was also grown the same,under COBs in a Octopot in a tent with the same feed,only difference would be UV.

Lab told me a closer place to drop off my sample and they would pick it up next Monday.

captainmorgan said:

Last test was done less than a year ago so it was also grown the same,under COBs in a Octopot in a tent with the same feed,only difference would be UV.

Lab told me a closer place to drop off my sample and they would pick it up next Monday.

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Aaaaaahhhh phoooie!!! I wanna know now!

RM3 said:

Been doin it for years, I even use UV on seedlings, there is zero stress if done right and the coolest thing you will ever see is to have an 8 bulb T5 veg light with one UV bulb in it and put 20 seedlings under it, within a few days they will all, yeppers every one, grow towards the UV bulb, They freakin love it

a two week old seedling for your viewing pleasure
.
View attachment 3678116

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I wonder if it has a lasting effect on the plant if you give them high UV right from germination. Might make them more hardy or be programmed to develop more trichs than normal. What if you used a Lizard CFL as the actual grow light? Not that great a spectrum but it would work. It's just on the yellow side.

I use uv from sticking 'em in the ground and they start trichome-ing? on sprouting , as Rn3 says, after a few days they're full of them, i also leave it on 24/7.
U.v lingers around after sundown so it's present all night long, it's not powerful enough to leave the atmosphere. its the way the natural spectrum is.
never tried reptile lights always used fish tank ones (i like the color).
also if you use green on your seeds before planting = slightly bigger yeild...yes Bobcajun your right

pookat said:

I use uv from sticking 'em in the ground and they start trichome-ing? on sprouting , as Rn3 says, after a few days they're full of them, i also leave it on 24/7.
U.v lingers around after sundown so it's present all night long, it's not powerful enough to leave the atmosphere. its the way the natural spectrum is.
never tried reptile lights always used fish tank ones (i like the color).
also if you use green on your seeds before planting = slightly bigger yeild...yes Bobcajun your right

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Oh you tried green light on seeds? Was it a laser or what? On the UV, I guess I should start some seeds under reptile lights then.

Pinching the plants is a completely different stress than UV.

Cannabis does not use resin, THC or Trichomes to deal with UV. This is a fallacy

BobCajun said:

Oh you tried green light on seeds? Was it a laser or what? On the UV, I guess I should start some seeds under reptile lights then.

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Only green led's, had 'em on for a day off 9v then plant then put the uv 3" over on the next day, i tried yellow light in the late 80's =not the best results but times change as with technology, you end up mixing the colours for a few microseconds at various times to encourage triggers aaaah!!...ya got ma brain going again.
Even so, you can't beat Natural methods, only try to mimic. It's a big subject with many variables where subtle effects cause major changes...some good - some not. i put a pic on Schnooby's tesla thread.... 7wk under 2" tiny Durban.
Experiment but keep a real grow for smoking , just in case.
good crops = grow like Rm3, from what I've seen (oooo, very Sexy in blue).

Following this one!

pookat said:

Only green led's, had 'em on for a day off 9v then plant then put the uv 3" over on the next day, i tried yellow light in the late 80's =not the best results but times change as with technology, you end up mixing the colours for a few microseconds at various times to encourage triggers aaaah!!...ya got ma brain going again.
Even so, you can't beat Natural methods, only try to mimic. It's a big subject with many variables where subtle effects cause major changes...some good - some not. i put a pic on Schnooby's tesla thread.... 7wk under 2" tiny Durban.
Experiment but keep a real grow for smoking , just in case.
good crops = grow like Rm3, from what I've seen (oooo, very Sexy in blue).

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Did you read about the green light seed treatment in this article or is there another article about it?

Is that this one, it covers a bit on circadian cycle triggering connection through different light frequency's ?
I love to play with science stuff, i did a lot of light stuff when i left school i had a mate did lighting for a theatre so got hold of some awesome lights filters etc, we both liked a smoke and grew in competition to each other.
Its a good read (its full of really big words i don't like. should have more pictures).

On second thoughts that might not be the circadian one, may have lost that to another Tesla+computer= Empty Hdd
if it is it only hints at it.