How many plants you got growin?
If only one, then you could get away with using just those four all the way thru......The 2700K are for Flowering as they give off more of the red and the 6500K give it the blue for veggin........ So I would think that you could get a decent yield outta one plant with those four lights???
Anyone else, please correct me if I'm wrong......As I'm new to the CFL scene and am only speaking on what I have read thru reputable sources........Hahahahaha- seriously tho......