For veg you can get away with 15w CFLs per foot if you want but I wouldn't go more then 1 foot between per 15w CFL. Flowering you need to most power. The way I had my setup done I was pulling 1/4 ounce off each plant every week because I put 1 plant in to flower under a single 45w CFL. When Flowering the tops are the gold spot the bottom parts isn't going to produce the biggest buds unless you give them alot of light at the bottom to but that's where the LST comes in hand because you can train your plant to grow flatter like its on the ground and thus making as much of the plant budding sites able to get the light. this can be very useful if you don't want to carry alot of plants you can grow your plants the LST way since the new growth grows up to the light.