I use flouros for my veg room and they work just fine but the growth is notably slower than when using a MH setup, but until I can afford to replace my MH ballast, this is how it will be. Lince makes a good point when saying that you might not want your mothers to grow too fast. Unless they are very healthy, they will be stressed, and stressed mothers produce thin, lanky growth, which makes for weak clones. When my veg ballast burned out and I put the flouros in, I was really amazed at how much less heat they put out, and I'm still getting nice green leefy veg growth but even with all that being said... I miss my MH rig.