Go with the first. It puts out 55,000 lumens from the hps bulb, as they claim. Thats enough to grow 8 plants well, or 6 plants really well. The second is nice in that it has both mh and hps, but the mh bulb puts out 38,000 lumens. I get the idea- use MH for veg then use HPS for bloom. That's all...