UVB increases Potency

TheRealGreens

TheRealGreens

Member
So I have Ed Rosenthal's Marijuana Grower's Handbook and there a part in here that states this:

" The amount of UVB light a plant recieves affects THC and terpene prduction. Plants grown under higher UV levels are more potent.
The amount of UV light that an area recieves is determined by latitude, season, climate, and weather. Light reaches the equator most directly, and is the most intense. As the latitude increases light reaches Earth at a more oblique angle so it becomes less intense.
Throughout the northern hemisphere, which includes North America and Europe, UV light is at its lowest levels in December and January. After these months, the levels start rising. The further from the equator, the longer it takes to peak, the shorter the peak period and weaker the light.
For instance, in San Francisco ( latitude 37.75 ), UVB reaches its peak with a UVB index between 9-11 around May 15th. It stays there until around August 15th. By Sept. 1 it drops to 8 and by Oct. down to 6.
If you can ripen plants during the peak UV period the plants will be most potent. As the season wears on and the UVB levels decline the marijuana does not attain the same potentcy.
Using this information, no matter where you live, even in the far north you can grow potent
plants using light deprivation, so that plants ripen at the peak period rather than late in the season.This Chart can help determine a planting strategy."
This Pic is a bit crappy but it is the chart showing UV indexs of 2008 in Honolulu, HI lat N 21(red bar at top and I'm going down), Jacksonville,FL 30 N lat(pink), Raleigh, NC 35 N lat(yellow), Omaha, NE 41 N lat (purple), Seattle, WA 47 N lat(green), Anchorage, AK 61 N lat(blue the last bar). Now the chart on the x-axis(the one going sideways) shows months and y-axis is UV index rating 1-15.

Also says you can go to www.weather.gov and get UV info there.
Foto-0044[2].jpg


I have added one to my grow to test this theory.
 
TheRealGreens

TheRealGreens

Member
I feel that if this is true having a constant high amount UVB light with a rating of 10 (easy to find for reptile cages) you should have a better potency, although, it does not state whether this should be applied through Veg only mentioning harvesting. I am going to test with one on a plant in veg once I go buy another bulb and see how it reacts.
 
racerboy71

racerboy71

bud bootlegger
the only downside that i've read about when using uv lighting when growing is that uv light can make your trics mature super super fast, like to the point that they are way beyond peak potency when the buds are finished.. this is only if you use the uv lighting for too long of a period during the grow..
i think i've also read that you only want to use the uv lighting for around an hour or so a day during flowering to help increase potency, as any longer and you will start to get the degradtion i was talking about.. i'm not 100% sure on the correct amount of time though, but for some reason, the one hour thing kinda seems right..
i've been interested in using uv lighting for awhile now, but still haven't gotten enough info to convince me that its a good idea, or even worth it in the end of the day..
 
PeteSwitch

PeteSwitch

Well-Known Member
TheRealGreens said:
So I have Ed Rosenthal's Marijuana Grower's Handbook and there a part in here that states this:

" The amount of UVB light a plant recieves affects THC and terpene prduction. Plants grown under higher UV levels are more potent.
The amount of UV light that an area recieves is determined by latitude, season, climate, and weather. Light reaches the equator most directly, and is the most intense. As the latitude increases light reaches Earth at a more oblique angle so it becomes less intense.
Throughout the northern hemisphere, which includes North America and Europe, UV light is at its lowest levels in December and January. After these months, the levels start rising. The further from the equator, the longer it takes to peak, the shorter the peak period and weaker the light.
For instance, in San Francisco ( latitude 37.75 ), UVB reaches its peak with a UVB index between 9-11 around May 15th. It stays there until around August 15th. By Sept. 1 it drops to 8 and by Oct. down to 6.
If you can ripen plants during the peak UV period the plants will be most potent. As the season wears on and the UVB levels decline the marijuana does not attain the same potentcy.
Using this information, no matter where you live, even in the far north you can grow potent
plants using light deprivation, so that plants ripen at the peak period rather than late in the season.This Chart can help determine a planting strategy."
This Pic is a bit crappy but it is the chart showing UV indexs of 2008 in Honolulu, HI lat N 21(red bar at top and I'm going down), Jacksonville,FL 30 N lat(pink), Raleigh, NC 35 N lat(yellow), Omaha, NE 41 N lat (purple), Seattle, WA 47 N lat(green), Anchorage, AK 61 N lat(blue the last bar). Now the chart on the x-axis(the one going sideways) shows months and y-axis is UV index rating 1-15.

Also says you can go to www.weather.gov and get UV info there.
View attachment 1407887


I have added one to my grow to test this theory.
Click to expand...
I just finished that book up last night after downloading it on my iPhone! That was deep shit that covered a ton of things on growing cannabis, don't you agree? Now I'm diving into Marijuana Horticulture by Jorge Cervantes and I was planning to try out the UV light theory as well. Post your findings on here when you harvest or find anything you think may be out of the norm for adding that into your grow.
 
TheRealGreens

TheRealGreens

Member
PeteSwitch said:
I just finished that book up last night after downloading it on my iPhone! That was deep shit that covered a ton of things on growing cannabis, don't you agree? Now I'm diving into Marijuana Horticulture by Jorge Cervantes and I was planning to try out the UV light theory as well. Post your findings on here when you harvest or find anything you think may be out of the norm for adding that into your grow.
Click to expand...
Nice to see someone else saw what I did :D.I also have the Marijuana Grow Bible I think is what it was, a buddy has it atm but when he brings it back I'm going to see what it states of UVB.
 
Dizzle Frost

Dizzle Frost

Well-Known Member
racerboy71 said:
the only downside that i've read about when using uv lighting when growing is that uv light can make your trics mature super super fast, like to the point that they are way beyond peak potency when the buds are finished.. this is only if you use the uv lighting for too long of a period during the grow..
i think i've also read that you only want to use the uv lighting for around an hour or so a day during flowering to help increase potency, as any longer and you will start to get the degradtion i was talking about.. i'm not 100% sure on the correct amount of time though, but for some reason, the one hour thing kinda seems right..
i've been interested in using uv lighting for awhile now, but still haven't gotten enough info to convince me that its a good idea, or even worth it in the end of the day..
Click to expand...
didnt know that part...good piont tho..maybe its best to use for the last 3-4 weeks of flo?
 
THCBD

THCBD

Active Member
TheRealGreens said:
I feel that if this is true having a constant high amount UVB light with a rating of 10 (easy to find for reptile cages) you should have a better potency, although, it does not state whether this should be applied through Veg only mentioning harvesting. I am going to test with one on a plant in veg once I go buy another bulb and see how it reacts.
Click to expand...
not necessary in veg. any extra light will help, but uv only is necessary in flowering to boost thc production at the ideal time. give it a shot though, let us know of any changes in your veg cycle.
 
420God

420God

Well-Known Member
I'm running a UVB 10.0 reptile bulb for 6 hrs in the middle of my 12 hr light schedule to mimic the sun.

Out of my research this is what I believe to be right.
 

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homebrewer

homebrewer

Well-Known Member
Unless you've mastered indoor growing and can maintain healthy plants until harvest day, I wouldn't suggest running out and buying a dozen reptile bulbs. Today's herb, when grown correctly, is already incredibly potent.
 
Total Head

Total Head

Well-Known Member
homebrewer said:
Unless you've mastered indoor growing and can maintain healthy plants until harvest day, I wouldn't suggest running out and buying a dozen reptile bulbs. Today's herb, when grown correctly, is already incredibly potent.
Click to expand...
thank you buzz killington. lol j/k i hear you. noobs and semi-noobs and the magic wands and such...i for one am looking forward to a time when there are an abundance of finished journals using uvb. there is still plenty of mystery and debate about the proper way to incorperate them into a grow and how to get the most out of it. i agree that there isn't much point unless you already have shit dialed in to a t.
 
TheRealGreens

TheRealGreens

Member
Well according to the book it doesnt state that it should only be used a small period of time. That is why I want to test it. Unfortunately I do not what I grow as they are saved bag seeds. So if its not a good strain I had and kept a seed just cause it was nice and the only one there, and if I can increase it in anyway, I feel its worth a shot.:idea:
 
Dwezelitsame

Dwezelitsame

Well-Known Member
im gardening now for 2 years this past december i have been useing a uvb for about a year plus -i started with a uvb 10 it broke and i uped to a 20 i see no dif in 10 and the 20 so i think a 10 is all that is needed

it does increase trichs im not sure if it ups potency i think potency is predetermined by genetics -i have had top smoke wit a few trichs and mids wit an abundence of trichs -if you work wit trichs like hash and budder and stuff its better to have more-i have smoked different weeds trichs and find the same thing as wit bud varies in strenth based on genetics of plant ---my conclusion is more trichs not necessarly mean better head if from a weaker genetic
 
TheRealGreens

TheRealGreens

Member
My thought is if it was poor Genes and you incresed it it, just think how poor it would have been before hand. Thats what I have to keep in mind again since they are bag seed and I didn't label them.... My bad there but I still want to achieve my highest available potency in my growing conditions. Granted I also read all sources should be optimum levels to achieve this and light is one of my lowest next to Co2, so we shall see..
 
kether noir

kether noir

Well-Known Member
i use 3 10.uvb bulbs for 6hrs of the flower cycle, moving the bulbs here and there. and have had good results
 
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