MH bulbs do not produce any UVA/UVB spectrum. Only HPS bulbs do. Even my 1000w HPS dual archs don't produce enough to show an increase. As soon as you put them in a hood with glass between them you loose it all. Plus uva/uvb rays only penetrate a few inches away from the source. The new 10.0...
I just completed 2 full years of testing on over 10 different strains and have reached the conclusion that the uvb uva light spectrum will add 3-5% THC and .0-.5% bcd over all strains tested.
I published my research on Academia.org Here is a link to my notes as well as research I found in my...
