Oh btw, this is a great link not only for you but anyone reading. Its lighting made simple. Great reference, only thing it doesnt have is the lumen chart. But honestly i was reconsidering your situation -- You can convert a home depot / lowes / wallmart 70w HPS outdoor light. Kill the dusk to dawn sensor.

48w CFL = lets say at BEST 3k lumen.

If you had two 48w CFL alone, you would have 6k lumen not to account for loss. Thats 96w. You little 70w light already has 2 CFLs beat both in wattage and output. Again, just a thought. Grow and let grow :thumbsup:

ACF Indoor Plant Grow Light Information Guide -- The link ( Lighting chart ) --