I assume your looking for cfl's. You want 1 light per plant for the first 2 weeks, after that you'll need more, at least 3 per plant to get any good growth at all. You want the daylight 6500K cfl's during your veg stage.
If you must flower with cfl's get the biggest ones you can find...usually the 42W 2700K warm white cfl's. Plan on doubleing up on bulbs for flowering as the plants need alot of light to produce all it's sugars and oils and such. Make your grow space as reflective as possible, that means getting mylar, you can easily get that cheaply from chip bags, and from the shiny wrapping paper bought at stores...but the mylar on the rolls are the best.
Good luck!