Well, I use CFL's because They are safer for my particular setup. They work great for me. My last harvest was 4 oz of cured bud off of one plant grown fully from CFL's Use the general rule of thumb . Lumens per sq ft. Keep in mind CFL's do not penetrate well so only the top 14 - 20 inches gets good bud. At this moment I have 4 5 foot sativas with 900 actual wattage on the canopy and 100 watts from each side (for under canopy) 3000 watt equiv. They vegged wayyyy too long, I ran into a spider mite prob at an early age and did not want to flower until i eradicated. So I have monsters now. THey are fighting eachother for space in a 3 foot by 4 foot area in 5 gal buckets of soil. Things I have Learned. Grow more plants smaller! ALWAYS ALWAYS ALWAYS PH your water! Never NEVER get greedy with NUTES! Bringing in another plant is like unprotected sex, you want spider mites? Dip it in some insecticidal soap and monitor it for a few days first! WATER IS LIFE BLOOD proper water is a must I will soon post pics of my budding fems I guess a minimum of 2oz per plant a maximum of 4 oz per plant one more thing to get maximum size buds you need to keep the lights half an inch from the leaves, pain in the ass when your girls grow 2 to 3 inches a day. now the buds double in size every night i swear. So for anyone that says cfl's produce popcorn buds, I disagree. The grower creates popcorn buds. I see baseball bat like colas. Give me a few days to get batteries for cam. These pics are from my last harvest.