This guy has a pretty qualified-sounding explanation on the role of UVB in THC conversion

http://www.ukcia.org/research/opticsandthc.pdf

There's no UVB coming out of the other lights because most glass absorbs UVB.

You could just tend to your crop with sunglasses on. Plus you'll look cooler.
vostro Reviewed by vostro on . more thc does here know how i can increase tha amount of thc in my plant? Do i need to put sum kinda nutrients in it or sumthin else? Rating: 5