I am now useing 3 T5 units all with 2 bulbes each at 50watt a bulb I have 4 at 6500k and 2 at 3500k with my other cfls I am up to about 722 true watts with about 56,000 lummes. That with swaping to FFOF FFGB And FFBB my grow has major improvements the very first pic is of a white widow from my frist grow the other is from white widow at the same time with the upgrade lite and soil stuff.