uva light to enhance tricomb production

[DrPhoton]

Many older studies including the 1987 by john lydon, have shown that UV-b has a direct effect on cannabinoid synthesis. Mainly THC. But this paper has created confusion as it does not consider or discuss about the possible effects other wavelengths of light has on cannabinoid morphology. So many assume that its only UV-b. Most recent studies have shown that it likely is not just UV-b but also UV-a which can stimulate THC biosynthesis and manufacturers like black dog have made their own conclusions through their research that UV-a is as effective. And now include that spectrum as apart of their products.

[Greenleaf]

DrPhoton Yes sir you are correct. I'd like to find a copy of that 1987 book by John Lyndon but it seems very hard to find, if you google the name the only John Lyndon that comes up is the lead singer of the Sex Pistols (Johnny Rotten). Everything I've read so far concurs, that UVB raises total cannabinoids but lowers yield.

[starramus]

Greenleaf The article appeared not as a book, but as an article in the journal Photochemistry and Photobiology Volume 46 #2 pp. 201-206 written not by a Lyndon, but John Lydon. Here is a quick link to the pdf file. https://pdfs.semanticscholar.org/128...49ce481759.pdf Ain't Google wunnerful? Read on.

[Greenleaf]

starramus Thank you for the correct link, I'm an idiot sometimes lol.

[starramus]

The price on these lights tends to bring into effect the law of diminishing returns. https://www.amazon.com/s/ref=nb_sb_n...LED+Grow+Light

[starramus]

maybe one of these cheapies would be just as effective. https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
BIG BIG BIG smiley! I got mine for $37.00 on one of those quick deals. But for posters not my grows.

[starramus]

Quantifiable results were shown in Lydon's experimentation.

[starramus]

Title of this thread should be corrected to: UV B light to enhance trichome production.

[Greenleaf]

starramus Like I said, I'm an idiot, I actually meant to write UVB.

[Farmall]

I’d blame it on autocorrect..!

[starramus]

Greenleaf posted "Like I said, I'm an idiot, I actually meant to write UVB."

Actually thank you for posting this thread. I must confess to being ignorant on this aspect of growing, and have become edjumicated on the subject. Thanks to Toker1 for his input, and of course DrPhoton for his invaluable reference to John Lydon's research. Most enlightening demonstrating that their is appreciable benefit from irradiating with UV B.

[abdulwahabmalik]

For Your information, I have not used UV whichever its flavor, nor am I Doctor Photon, but I would think it best to emulate the spectrum of natural sunlight as it falls upon the earth. The cannabis plant has evolved through natural selection and fine-tuned itself to this natural light source. Below is a chart showing which UV rays actually penetrate the ozone layer, and which do not. Therefore I would say that UV A would be beneficial to resin production whereas B and C might be detrimental. Maybe DrPhoton can clarify this for us.


Ultraviolet A UVA 315–400 3.10–3.94
(0.497–0.631) Long-wave, blacklight, not absorbed by the ozone layer
Ultraviolet B UVB 280–315 3.94–4.43
(0.631–0.710) Medium-wave, mostly absorbed by the ozone layer
Ultraviolet C UVC 100–280 4.43–12.4
(0.710–1.987) Short-wave, germicidal, completely absorbed by the ozone layer and atmosphere