So have you grown with a UV bulb before?! I dont know why but i've never thought of this im sure it would help the grow a little because the sun puts out UV also! QUOTE]
yes you are right that the sun puts out uv light but not all of it reaches the earth(ground) and not all of it is useful for our purposes. i believe the numbers are 280-290nm are the best for buds. these are uvb. reptile uv bulbs have them, most fluoros have them and hid, just not in the % that we want them. bud uses tricromes as a sort of sunblock so to speak, which is most influenced by these wavelengths. more uv= more trichromes. this is my experience with this and i am not sure where i got some of this info, but i believe most of it was from rosenthals. they make uvb fluoro tubes of the 40w 4ft type (as well as others) that are almost specifically 280-320nm, and NB(narrowband) uvb bulbs which i not sure of the wavelength but its around 280 or so but only that wavelength. these are used for light therapy for skin conditions. i use the uvb 40 4ft 280-320 style but i gradually introduce them over a period of time throughout the plants life til they are running the full time. i have noticed huge changes in my buds! these are the best advise i could give anyone, just make absolutly sure you know what you are doing as they are dangerous and will burn you!!, always have them on a seperate switch/timer or whatever that you can turn off before/as you enter the room. i use these type as the fixtures for them are dirt cheap... your standard workshop light. they are expensive