Sorry to be a party pooper here but W has very little to do with your lighting.
W is a measure of power, when related to lights, it is usually expressed as power consumed and bears no relation to the efficiency of the output of the light. If you had 23 x 26W cfl's this would total almost 600W yet this would produce a max of (1750 x 23) 40,250 lumens, a 600W hps will produce 90,000 lumens. So as you can see, you are not using the correct unit for your needs.
What you should be interested in is Lumens, which is a measure of light intensity or how bright a light is.
So your first interest should be in lumens. However lumens on their own or Wattage for that matter will tell you nothing.
You need your measurement to mean something. Lumens per plant???? This too tells you nothing.
The reason for this is I may grow a 4ft tall, 3ft diameter plant, this obviously needs more light than a 9" auto.
The measurement you are looking for is lumens per sq ft of canopy space.
So, while a plant is in veg, you need a min of 3,000 lumens per sq ft of canopy, for flowering it is a min of 5,000 lumens per sq ft of canopy.
The spectrums of light Evil mentioned are correct, Daylight (6500kelvin) for veg, Warm (2,500 kelvin) for flower.
Sorry if this was all very technical but I would rather know someone gave you correct information than partial information.
Peace W
