Quote Originally Posted by Zcomp
Yup, you guys need to read this: http://www.greenmanspage.com/guides/thc.html
Interesting stuff there...

According to that article:
Cannabinoid pathway: Anywhere in this pathway UVB does a better job than UVA in energizing a phytochemical reaction that will produce more fully realized THC because "all cannabinolic compounds show an absorption maximum between 270 and 280 nm in the ultraviolet region."
So then if those findings are correct, that would mean the most beneficial range of 270-280 doesn't quite fall into the UVB category... it's UVC.

Every source I find will list the cutoff between UVB and UVC at 280 or 290 nm. That's just splitting nanohairs! Never-the-freakin-less, anything between 270 and 280 is still gonna be considered as UVC.

Actually, who cares what it's called, right?? It's close enough.
As long as it works!
The UVB light should work great but if you want to get technical about it and purchase some LEDs, then perhaps that 270-280nm might be your best bet... but good luck figuring out how many individual LEDs you need for that!

Oh yeah, and if you want more confusing stuff to read about it, check this out:
Comparison of three advanced chromatographic techniques for cannabis identification
3rd paragraph of the Findings section mentions all that UV absorption stuff with and a couple graphs to look at.

And now for another bit of random info from iguanaden.org
"Most tube-style UVB bulbs lose their effectiveness in about 6 months, even though they still produce light.

I'm not even growing at the moment yet I'm starting to get obsessive over this stuff.... someone please put me out of my sobriety
GreenDestiny Reviewed by GreenDestiny on . UVB BULBS anyone use em currently? im thinking about it but would like to know if they are any good. and also what kinda temp does it (they) put out Rating: 5