When you want the plant to flower, you have to give the plant 12 hours of uninterrupted darkness (hence, the 12/12 cycle). 12 hours of light, 12 hours of dark (so dark that you cannot see your own hand in front of your face).

Getting the right type of light will help (6500K for veg, 2700K for flower, or thereabouts), but the most important are the dark cycles for flowering.

As for the UVB, it's something to experiment with. Some say they help with trichome production, but then again they are dangerous for the eyes.

I'd really focus on getting the basics down right now. More lights (150w+ of cfl's), making sure the plant gets fresh air, at the right temperature, and getting the right nutrients for veg and for flower.

As for your original question, it depends on how much space you have. Also bigger plants require more light, more nutrients, more air, ect.

Happy growing :jointsmile: