Yield will depend on how long is was vegged for, what size pot it's in, and what strain you're growing (some are heavier producers than others). I've done mostly scrogs with my 150w hps in closets and have gotten between 1/2 and 1 oz generally in two gallon pots, occasionally slightly higher if I vegged the plants longer, but always did scrog, and always kept the light no more than about 6 inches from canopy. One time I grew three taller plants in 3 gal pots, not scrog but tree style, they grew to four-five feet and yielded avg. 1.4 oz each but I did add supplemental light on the sides (six vertically oriented T12 fluorescent tubes, one in each corner of the closet and two on the sides) and I vegged these plants for about six weeks before 12/12. I still like scrog better as the setup is more compact, but sog with a larger # of (smaller) plants would work well too...but if you plan to grow only one plant, scrog is the way to go, imo, you can get an oz or more from one decent yielding plant.