UVA/UVB the real deal. A must read topic for all growers.

Yodaweed

Yodaweed

Well-Known Member
I run mine from beginning of flower until harvest, honestly you could wait 2 weeks into flower then start your UV-B but I run throughout flower
 
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az2000

Well-Known Member
Lysergicpt said:
do you guys keep the lights on right until harvest day ? or you turn them off a few days earlier?
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I've read UVB can cause ripening trics to turn amber sooner, so it should be started late veg, reduced in mid flower and stopped in late flower. See:

start in late veg and go 8-10 hrs uvb in the middle of the 12 hour on period til 4 weeks flower, then 5-6 hrs from 4th week flower to 6th week, then back it off as you see trichs mature... (assuming 8wk)
-- http://forum.grasscity.com/advanced-growing-techniques/204627-uvb-light-test.html?p=4301731
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use appropriate schedule/timer 8hrs in the middle max starting late veg, and back it off after mid way flower.
-- http://forum.grasscity.com/advanced-growing-techniques/204627-uvb-light-test.html/page-2
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I don't run mine that long. I do 3 hours per day, around 1-2 mid flower. When I ran mine (inadvertently) for 6 hours it seemed to blister the leaves. I've only been using UVB for 4-5 months. Eventually I'll try increasing the time.
 
Lysergicpt

Lysergicpt

Well-Known Member
az2000 said:
I've read UVB can cause ripening trics to turn amber sooner, so it should be started late veg, reduced in mid flower and stopped in late flower. See:





I don't run mine that long. I do 3 hours per day, around 1-2 mid flower. When I ran mine (inadvertently) for 6 hours it seemed to blister the leaves. I've only been using UVB for 4-5 months. Eventually I'll try increasing the time.
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Thx for the input
Now i'm running mines 5 hours in the peak hours of the light time , the leaves seem fine so far soo i will leave it until harvest that is probably in the next 2 weeks.
But next grow im planing on starting the UV in small doses in Veg and then increase in flowering to see if there is any diference on the final product.
 
ODanksta

ODanksta

Well-Known Member
The best way to achieve usable UVB light is run 4K ceramic halides retro whites bulbs the last 2 to 3 weeks of flower without glass on your hoods
 
Lysergicpt

Lysergicpt

Well-Known Member
ODanksta said:
The best way to achieve usable UVB light is run 4K ceramic halides retro whites bulbs the last 2 to 3 weeks of flower without glass on your hoods
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i agree its a viable option , but after alot of reading i have to disagree with the part of the "best way" because , alltought it have some usable amount of UVB in the correct wavelenght its stays way behind of some UVB lights , terrarium or medicinal , of course medicinal lights are the best ones out there , but they are also very expensive.

But by no means as an easy solution, i disagree with final 3 weeks MH with no glass , i have tested it myself with some great improvments in my white widow.
 
fishdeth

fishdeth

Well-Known Member
Just installed a 26W "lizzard" bulb in my fridge.
Will be transplanting the plants Oct 2nd.
Wh not leave it on in veg as well?
The natural UVB in those rich regions of the earth are always on, right?
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T

tsmit420

Member
GreenVet said:
Again I won't be 100% sure until i smoke these buds after curing in 4-6 weeks, but it sure does look like UV ones are gonna be much better, the trics are almost twice the size with weeks to go.
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i think the real benefit is with terps, genetics has brought the thc so high i could really care less about it, but terpines are a true sign of quality and they play a role in how the thc is experienced. cannabis has caused so many different crazy experiences witth me anything is possible. many plants likes rosemary are commercialy produced indoors specifically for extraction of essential oils, UV supplementation is extremely common in these facilities. in the commercial industry the mighty dollar is all the matters and theories have no place. they certainly wouldn't be using UV unless it let to more essential oils and more profits
 
Rollverine

Rollverine

Well-Known Member
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