2700k is on the red side of the light spectrum, which is good for flowering. 6400k is on the blue side, and good for veg.

If you invested in a blue spectrum cfl, you'd see better growth during the veg stage, but it's up to you.

Best thing to do is read as many related posts you can and make your own mistakes.

The plant I'm flowering now was originally supposed to be my Mom plant, but from all the clones and cuts I made, it has turned into a real bush, and perfect for flowering.

Good luck with your plants, eh!