Of Course MV works, I used to use 2 175w myself to grow and they work fine (5900k coated bulbs of course), people seem to hate the idea of using something so inefficient (they are, but not that bad) but they do a good job and don't put out nearly as much heat as one would expect (less than a 150w hps). Now I have two remote-ballasted mv's collecting dust, I'll probably end up using one or both in a seedling cab in the future, but for now hps still rocks my socks.