Forum Shop Market
Seeds FAQ Tools
SEE OUR MARIJUANA SEED GUIDE FOR THE BEST STRAINS
Looking for Legal Marijuana look no further!
Go Back   Marijuana Growing > The Grow Room > Indoor Growing


Reply
 
LinkBack Thread Tools Display Modes
  #1    
Old 02-03-2009, 05:03 PM
Stranger
Stranger
botanyofdesire is offline
 
Join Date: Feb 2009
Posts: 1
botanyofdesire is on a distinguished road
Points: 17, Level: 1 Points: 17, Level: 1 Points: 17, Level: 1
Activity: 0% Activity: 0% Activity: 0%
Lightbulb The Effects of UV light on Cannabis Production and Potency
I was doing a Google search on something and stumbled upon an old thread here that had some discussion about UV light. Some people were very fast in there belief that UV has no effect on plants, well others, one even said Ed Rosenthol claimed that UV light would increase potency.

For some reason this debate seemed to stop inconclusively. I am new to this forum and apologize if the topic has already been brought back up and I am just unaware of it.

However this is a very interesting topic. So, what are your ideas? Do you have any information regarding the effects of UV light on cannabis growth or potency? Lets get that debate rolling again.

I have found this information (extracted from http://www.cannabisculture.com/articles/2696.html):

A researcher conducted a controlled experiment in a greenhouse. He lit a group of high potency plants similarly except with the addition of UVB light to some groups. He found that the percentage of THC increased in a direct ratio with the increase in UVB light. This research confirms the adage that high altitude plants are more potent than those grown at low altitudes.
If you look at old-world land races of cannabis, plants that have become adapted to the climate and latitude, the ratio of THC to CBD starts at 100 : 1 at the equator. At the 30th parallel (The Hindu-Kush Valley) the plants have a ratio of 50 : 50. At the 45th parallel the ratio is near 1 : 100. This corresponds roughly with the amount of UVB light received at these latitudes. There is much more UVB at the equator than the 45th parallel.
How can you get more UVB light to your plants? Certainly it's true that MH lamps emit more UVB light than HPS lamps. Still the amount that MH lamps emit is small. In fact, many manufacturers use UVB shielding glass to filter out most of the UVB that's produced. The UVB light the plant receives from an MH lamp does increase the plant's potency slightly at the cost of yield, but there are better ways to introduce UVB light into the grow room. They include reptile lights, which emit about 10% UVB, and tanning lamps.
The problem with using these lamps is that they are associated with increased number of cancers and many other problems. They should not be on when you are in the grow room. Not much research has been conducted on using them to produce higher THC values. I will do a full report in a future issue.

Last edited by botanyofdesire; 02-03-2009 at 05:11 PM..
Reply With Quote
  #2    
Old 02-03-2009, 08:44 PM
BloodShot420's Avatar
Stoner
Stoner
BloodShot420 is offline
 
Join Date: Jul 2008
Posts: 733
BloodShot420 is a jewel in the roughBloodShot420 is a jewel in the roughBloodShot420 is a jewel in the rough
Points: 3,151, Level: 8 Points: 3,151, Level: 8 Points: 3,151, Level: 8
Activity: 2% Activity: 2% Activity: 2%
yo mon - check it -> 10.0 uvb light

i use them, and i'm gonna double up for the next flowering cycle...
Reply With Quote
  #3    
Old 02-05-2009, 10:34 AM
Stranger
Stranger
Buddist is offline
 
Join Date: Dec 2008
Location: Canada
Posts: 6
Buddist is on a distinguished road
Points: 146, Level: 1 Points: 146, Level: 1 Points: 146, Level: 1
Activity: 0% Activity: 0% Activity: 0%
Default UV and potency
This is an important piece of info!

It is assumed that THC is produced to protect the cannabis from herbivores. It also has been discovered that the crystals block UVB 275nm - 325nm range - the most harmful part of the electromagnetic spectrum.

Im no science wiz but it seems logical that any plant with these features might just produce more trichomes if threatened by UVB

Low presure mercury vapour lights (flourecent) have a coating on the inside of the tube to convert UVB into less harmful wavelenghts.

Im going to elevate the UVB on a few on my flowering girls. YIK!

Stay tuned!
Reply With Quote
  #4    
Old 11-03-2009, 09:44 PM
curioushiker's Avatar
Able To Roll A Joint
Able to roll a joint
curioushiker is offline
 
Join Date: Oct 2009
Posts: 81
curioushiker is on a distinguished road
Points: 330, Level: 2 Points: 330, Level: 2 Points: 330, Level: 2
Activity: 6% Activity: 6% Activity: 6%
Why did this thread die? This is a very interesting idea.
Are there any new discoveries about UV lights and canabis?
Reply With Quote
  #5    
Old 11-03-2009, 11:10 PM
MEANGREEN69's Avatar
Stoner
Stoner
MEANGREEN69 is offline
 
Join Date: May 2008
Location: las vegas nevada
Posts: 977
MEANGREEN69 will become famous soon enough
Points: 4,325, Level: 9 Points: 4,325, Level: 9 Points: 4,325, Level: 9
Activity: 2% Activity: 2% Activity: 2%
nice thread, i read some were that grew at i higher elevation were more potent but yeilded less then the plants that grew at a lower elevation...
Reply With Quote
  #6    
Old 11-04-2009, 01:45 AM
Yota's Avatar
420 TIME
Stoner
Yota is offline
 
Join Date: Jun 2007
Posts: 566
Yota will become famous soon enoughYota will become famous soon enough
Points: 3,879, Level: 9 Points: 3,879, Level: 9 Points: 3,879, Level: 9
Activity: 0% Activity: 0% Activity: 0%
There are some very lengthy threads and info on this if you do some searching around
Reply With Quote
  #7    
Old 11-04-2009, 03:43 AM
Learning How To Roll
Learning How To Roll
odin92681 is offline
 
Join Date: Oct 2009
Posts: 42
odin92681 is on a distinguished road
Points: 167, Level: 2 Points: 167, Level: 2 Points: 167, Level: 2
Activity: 0% Activity: 0% Activity: 0%
The whole LED area is new to all of us and it's important cause it would cut our electricity by $$$ not cents. We just need more data to be proved that if works.
Reply With Quote
  #8    
Old 11-04-2009, 06:57 AM
Able To Roll A Joint
Able to roll a joint
BobCajun is offline
 
Join Date: Jun 2009
Posts: 57
BobCajun is on a distinguished road
Points: 467, Level: 3 Points: 467, Level: 3 Points: 467, Level: 3
Activity: 0% Activity: 0% Activity: 0%
I saw a study that showed that plants grown with maximum UV were only about 25% more potent than ones with no UV at all. This proves that UV is not required for decent potency (as LED growers would know) but does make a little bit of difference. Since the UV is also dangerous to the grower, I would stick with normal lights myself but an extra 25% potency might be worth it to some people.
Reply With Quote
  #9    
Old 11-04-2009, 07:31 AM
curioushiker's Avatar
Able To Roll A Joint
Able to roll a joint
curioushiker is offline
 
Join Date: Oct 2009
Posts: 81
curioushiker is on a distinguished road
Points: 330, Level: 2 Points: 330, Level: 2 Points: 330, Level: 2
Activity: 6% Activity: 6% Activity: 6%
looks like the UV topic has been taken on at another thread heres the link. Great info!
Thanks.

http://www.rollitup.org/advanced-marijuana-cultivation/96571-10-0-uvb-light-new-post.html
Reply With Quote
  #10    
Old 11-04-2009, 07:38 AM
Jerry Garcia's Avatar
Teaching How To Roll
Mr. Ganja
Jerry Garcia is offline
 
Join Date: Feb 2009
Location: One toke over the line
Posts: 1,333
Jerry Garcia is a glorious beacon of lightJerry Garcia is a glorious beacon of lightJerry Garcia is a glorious beacon of lightJerry Garcia is a glorious beacon of lightJerry Garcia is a glorious beacon of lightJerry Garcia is a glorious beacon of light
Points: 19,497, Level: 20 Points: 19,497, Level: 20 Points: 19,497, Level: 20
Activity: 8% Activity: 8% Activity: 8%
Quote:
Originally Posted by BobCajun View Post
I saw a study that showed that plants grown with maximum UV were only about 25% more potent than ones with no UV at all. This proves that UV is not required for decent potency (as LED growers would know) but does make a little bit of difference. Since the UV is also dangerous to the grower, I would stick with normal lights myself but an extra 25% potency might be worth it to some people.
ONLY 25%!?!?!?!?!?!?! Make a little bit of a difference?

Who doesn't want an extra 25% potency?
__________________
Journal-------------->Blue Cheese, PPP, and Thai Super Skunk...Jerry's Second Grow New Pics 11/22
Go Bengals! WHODEY!!!
 

Tags
cannabis, effects, light, potency, production

Thread Tools
Display Modes

Thread

Thread Starter

Forum

Replies

Last Post

Effects of UVB radiation on THC and Trichrome Production KaliKitsune General Marijuana Growing 9 11-04-2009 10:14 AM
24hr light to 16hr light side effects?? plantsinpants General Marijuana Growing 4 02-06-2009 01:08 PM
Shortest vaible veg-times? Potency effects of early flowering? MGB508 General Marijuana Growing 4 12-29-2008 10:52 AM
what effects potency edprl Newbie Central 12 10-20-2008 06:25 PM
Health Effects of Cannabis thelittletruck Toke N Talk 30 02-29-2008 08:30 PM

Posting Rules

You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Come Check out a new Poker Forum for the online poker community

All times are GMT -7. The time now is 07:54 AM.
Powered by vBulletin
Copyright © 2000-2009 Jelsoft Enterprises Limited.

Content Relevant URLs by vBSEO 3.3.2