I use the MH for vegging, but in my first grow I found it a bit strong for seedlings so the distance required to keep it away from the seedlings to prevent burning meant there was some stretching initially. I agree with Stinky on the T5's although I haven't used them as this time for space I used the envirolites. However Ive read a few threads by folk here with good grows started on T5's, one grower I believe actually uses the T5's all the way through. Although not much help to your original question once in full veg I am aiming for a mix of of CFL's & MH because if I used more than the 250W MH in the space I have the temps would get way to high.