dudes I have 6 shop lights full specrum throwing off about 30,000 lumens I have went full cycle begining to finish with 30,000 lumen's of flourecent lights and my yeild was great! I guess if you can bring the flourecent lights up to a HIGH enough lumen,you could do just as well with your harvest! of course it may cost a little more in the long run but I used many systems and I found not much of a difference over all other then a couple of hundred bucks over a 2 year period............not a big difference.....not in anyway am I saying that mh is not as good of course I be a fool to say that infact mh is much better for growth plus much more,just wanted to make clear that you can pull off some good grows with flourecents!..............30,000 lumen's is 30,000 lumens not matter what lamp's you have......correct? if not please correct me.