1extraclip would know from personal experience as he has done a few rounds in his by now, I think. I just put my first crop into flower, I have heard the average of your first grow is 3/4 lb, give or take. DizzyTheBoss just got 4.5 oz off only 1 plant in his. I'm fairly certain that 4 lbs is a bit much. Usually it's grams to watts, so if you're running a 600hps, 600 grams is reasonable. Of course, CO increases yield. I have CO, but opted to wait so I could have a good baseline with less factors for my first grow. Most Trinity owners will tell you that the first couple of harvests are lower due to the learning curve. Usually by the 3rd they pull pretty good weight, and by then the expense of the Trinity has been paid for.
Most people run with only 3-4 plants, not 16, unless they're doing SOG. If SOG, getting the shorter profile SC would make more sense.
1extraclip, how many rounds have you done in your Trinity? What have your totals been of dry final yields?