Right, more lumens is good... And a 400W MH emits around 36,000 lumens, and an HPS 250 emits around 27,000 lumens... Just imagine how much more your plants would thrive with lumen levels in those amounts, with proper ventilation, of course...I prefer a 1 MH to 3 HPS ratio for flowering, 1150W to be exact... One 400W MH and 3 250W HPS... And I'm throwin about 115W Per Plant, or 10,636 lumens per plant, in my approx 10sq ft area... And that causes them to literally be all they can be, reaching their full potential...