Although the light doesn't look very good, you've purchased it and you should get at least one grow out of it, maybe more. It'll veg fine, but that's not enough power to flower 3 plants. It'll draw 160-170W actual, add some warm (2700k) CFL's or T5's for supplemental lighting when you flip to flower. I believe you said the space is 2x3' and you have plenty of height, keep the light 18-22" above the canopy, although you CAN go closer, don't, if you go too close you'll loose coverage and blend of the spectrums so it's not beneficial, been there, done that. If you don't get 3-4 oz from that light, it won't be a lighting issue