PhatJay is right.

Another pro is that using multiple smaller CFLs they add more points of light. Which does help with getting them bushier as well as making up for their lack of penetration.

Also if you use the smaller watt ones like 26w or 42w you will have to bring them down closer to the plants. They put out much less heat than your MH but they can still burn the plants if they are too close or the ventilation is poor.
GetThisOrDie Reviewed by GetThisOrDie on . Feelings on CFLS? I'm a mostly organic soil grower, I moved very recently and unfortunately am having to downgrade from a small grow room to a closet grow set up. I would really like to continue to grow perpetually with both vegeatative and flowering areas. I will be using one 400 watt MH/hps for my flowering area, and I would really like to be able to use another MH/HPS lamp for the vegetative but I'm worried about heat becoming an issue as is, even with some ventilation. A few friends who grow have suggested Rating: 5