Interesting read about UVA and UVB actions

[vukman]

Hello:

First post in this sub-forum but I thought it was necessary due to misconceptions (mainly mine), about the interplay of UV light on our beloved cannabis...
http://www.hempfood.com/iha/iha01201.html
Pate, D.W., 1994. Chemical ecology of Cannabis. Journal of the International Hemp Association 2: 29, 32-37.

The whole thing is an interesting read but scroll down to read about UV interactions....

 

[OLDproLg]

Saved!

Good read for shure..
im betting on more of insect repellent than light protection.
REASON=same strain grown 2 different seasons reveals big differences!
The resin production on the hot summer grow shows way less resin and a grassy tasting bud.
Under winter colder growth the same strain produces way more resin and true tasting buds!!!
28 lattitude area tests have concluded from my experience!!
tests were done with mostly indica breads,but sativas also show a less stress cooler enviroment is best..
Peace,Lg!

 

[Hempe]

this is a sexy read

 

[medmaker420]

yes that is a great resource!

nice find vukman

I would rep you but I keep giving out too much rep daily icmag won't let me

 

[DrFever]

I always really wondered about UV lighting and our plants , i mean with our atmosphere, and clouds blocking most of UV lighting if it didn't we would not be able to survive more or less get fried , nothing would grow
every time i go to a brunch and get food out of the trays low and behold there are UV lighting on food, thats to kill bacteria right
So thinking ok we put UV lighting on our plants how many generations of our strain will survive i mean UV and plants causes issues like genetic mutations, UV lighting is toxic period, causing cell break down list goes on, IMO adding UV is a recipe for destruction.

How the Sunlight Effects cannabis plant Growth

200 - 280 nm UVC ultraviolet range which is extremely harmful to cannabis plants because it is highly toxic.
280 - 315 nm Includes harmful UVB ultraviolet light which causes cannabis plants colors to fade.
315 - 380 nm Range of UVA ultraviolet light which is neither harmful nor beneficial to cannabis plant growth.
380 - 400 nm Start of visible light spectrum. Process of chlorophyll absorption begins. UV protected plastics ideally block out any light below this range.
400 - 520 nm This range includes violet, blue, and green bands. Peak absorption by chlorophyll occurs, and a strong influence on photosynthesis. (promotes vegetative growth)
520 - 610 nm This range includes the green, yellow, and orange bands and has less absorption by pigments.
610 - 720 nm This is the red band. Large amount of absorption by chlorophyll occurs, and most significant influence on photosynthesis. (promotes flowering and budding)
720 - 1000 nm There is little absorption by chlorophyll here. Flowering and germination is influenced. At the high end of the band is infrared, which is heat.
1000+ nm

 

[k-grower]

i´v seen very good results whit ghs ssh strain using reptiglo 5.0 reptile tube fluorocents, i have two of 90cm length whit 600w spna and closest leafs turn against those reptile bulbs instead of that spna light being available intensively side of these bulbs.

also it´s now week 4 from switching time period and i can see trichome´s on my bare eye what did not occur on last run whit out these uv bulbs untill several weeks later - the setup is same except these reptiglo.

dr.feever where did you get that information, if there is study about those claims i would want too see it - post link to this topic of the study or source?

including Pate, D.W., 1994. Chemical ecology of Cannabis and this study
http://www.google.fi/books?hl=fi&lr...redir_esc=y#v=onepage&q=uvb cannabis&f=false
http://www.thctalk.com/cannabis-forum/showthread.php?8154-UVB-Cannabis-science-report
also it´s widely know that sativa is equatorical plant from tropic where is high radiaton of uvb and uva as the sun comes closest to earth there, if you have been on that latitude you can feel it on your skin.