Sounds to me like you may have experience with one or two lights...but, when it comes to a larger grow you are lacking the needed skills. I have seen 10 lbs come from (3) 3x4 trays under (1) 1000k watt HPS.

it all depends on the strains and the grow environment. With that being said. Doing this with T5's can be done....and the electric bill is a lot nicer. But, the consistent weight will be difficult to maintain.

My advice...you will be 3 pounds of good sticky buds this way...but, not much more. The cola's just wont be that fantastic.