I fell in love with a t5 unit at a grow shop. They had a 8 bulb unit growing peppers - several different kinds. I couldn't help but notice how the plants themselves seemed to be glowing with light. I asked one of those salesmen -- the one that gives all kinds of advice and knows exactly why you are asking. Also happens to be the guy that sets up and maintains several grows in the huge grow store. So anyways I asked him about the light. He said once he tried one at home that his MH light has been sitting on the floor ever since. I asked him if changing the bulbs out for flowering was a pain in the ass.. He replied, I don't need to change out anything for flowering.. That bastard is doing autos! To bad I couldn't just ask him straight out.
But ya, ever since I got my t5, my yields have been way up. I don't have to mess around with lighting adjustments anymore like I would do with CFLs and LED's near as much trying to increase light area and intensity. I love my T5 eight bulb!!