Fluoroscent grow lights

HOW MUCH WATTS OF LIGHT DOES ONE PLANT NEED TOGROW TO MATURITY

depends how big you want it. I have seen plants under 10 inches tall and nothing but 1 bud that weighed in at at least a quarter. do that down a shoplight lenght and you could have about an ounce and a half maybe. but I would use 2 more shoplights for the sides and overdrive all of the ballasts 2x