They're going to swell a little but not dense like they would under more watts of CFL's, or HID lights, or the sun
If you can, give them some sunlight! it'll help them get fatter buds. Only growing with CFL's makes for fluffy, light buds. Speaking from experience from 1st grow. Growing under the sun now, and my clone of a plant from my 1st grow is swelling up FAST out there and its only 3 weeks into flowering. The mother of the clone never got close to this under CFL's