My suggestion is to surround your plant with as many cfls as possible: 6500K for veg, 2700K. (bulbs should give color temp. on the packaging, if not, you probably dont want it ha). surrounding your plants as tight as possible will help penetration. The result is a slightly smaller top cola, but a bushier middle section. this means bigger yield.

Take a look at my setup, I posted a pic. I have about 12,000-13,000 lumens in this space (4x27watt 2700k cfls, 1x42 watt 2700k cfl, 2x32watt 6500K tube flouro.) there are three cfl's surrounding the plants, one (the 42w) above all three, and one extra on top of the heavily budding one (not visible). I will move this extra one around as they finish. I saw a significant increase in the lower half of my plants once the lights were moved from all on top to this.

Hope this helps. :thumbsup: