check out dr bud greengenes at IC mag forum, cfl is the king when grown SOG 16 per square ft. in cut down 20 oz plastic bottles, fed with poop teas etc. check out his grow with pictures every other day,thru flowering,I have both HID and 1500 watts of t5 ho as well as cfl, I wish I had not bought the HID. The future is flourecent , growing large plants does not compete with using large clones almost directly to flowering cycle. He has to do a lot of clones, you can't be lazy and do it his way.
His methods break rules but you can't argue with his figures, I like big nugs like everybody else, but that is not the most efficient way to grow.
The jury is out HIDs are satan, why spend your money or go to a grow shop if you don't have to? I guess if you are lazy the HID and pre-made nutes are the way to go
http://www.icmag.com/ic/showthread.php?t=88449&page=1&pp=15