Wow!! This thread has been hijacked man!! Nice to see dudes going postal!!
Hey man, you have frosty nugs and a great setup. Props to you on that. Your attitude is shit though and you are really being a dick to the OP. This is his journal man. Don't go flaming the shit out of it. If he does't want to take your advice then just leave it on the door and go about your business man. Looks like you got plenty to keep you busy anyway.
Your math is still WAY off though. Please don't flame me but you aren't getting close to 2.2gpw (grams per watt). That's not how it is measured. You stated that you get 12 cuttings an push them to flower and they give you 12-14 zips. So say 14; that is 392g. 392/600 is 0.653gpw. Just going based on your statements. 12 weeks is 4 harvests. You have 3 600w lights and 3 trays. You measure each harvest. Not 4 harvest and then divide it by 3 lights. You are a little off there. If you wanted to take the average then you would do (using your numbers): 3 harvests in 9 weeks. 36 zips is 1008g. 1800w of light. 1800/1008 is .56gpw.
I don't think you understood the whole gpw (grams per watt) thing. Lot of growers don't know about it or really don't think it even carries any weight. I'm still on the fence though. I just figured you didn't understand it cause if you did you would know that 2.24gpw on a horizontal grow is fucking impossible. On a veritcal stadium grow it would still be damn near impossible. I've only seen it done once on a stadium grow and that was by Heath Robinson. No offense but you aren't him.
Much love everyone...let's get this thread back on track.