Honestly flourscent lighting needs to be the correct colour temp for plants to do there best. If your using CFL's you're going to need ALOT...trust me, once they hit a foot tall you need top and bottom lighting. Getting both the 2700K and 6500K are reccomended for BOTH veg and flower, mimicing the sun's colour temp (around 5000K) actually produces 20-30% more trich production then standard HPS bulbs. Flourscent tubing is better then CFL's for that reason alone...you can buy 5000K which is very close to the sun's temp, and then by adding a 3000K tube for every 3 5000K you get as close to the sun's output as possible...thus producing you more potent buds, that's another reason why good pro grower's will use both MH and HPS at the same time. And honestly...WHO doesn't want better bud?