Even with only 2 or 3 plants you are going to need more lights than that to do very well at all. I would have at LEAST 4 of those bulbs per plant. 4 will get you started ok, but they will grow fast and you should plan on adding more.
If you dont have enough light your plants will be weak and grow tall and skinny. Then the lights you have above the plants will only reach the top and the rest of the plant won't get any light. You know wut I'm sayin? the more light you start out with the shorter, and denser you can keep your plants. When they are short and dense you can get away with less cfl's then if they are tall and stretched. That's why people LST alot with cfls because you can better utilize whatever light you have.
THE LIGHT FROM CFLS DOES NOT WORK FROM A DISTANCE! CFL lights must be VERY close to satisfy the plant.
Make sure you read the growFAQ and the sticky about light proximity!
Good luck, happy growing.