A four bulb t-5 set up generates the same amount of lumens as a 400 W MH with only using up 53 watts of electricity per bulb. Also the heat is going up because the ballast is on top of the fixtures so the heat radiance is low.I use shop lights(w/ 4 34w T-12) for my clones and my mothers. Would my veg growth be much better with t-5's? I think the answer would have to be yes but is the amount of growth worth the purchase. Are we talking an extra 2 inches a week or what?