dude whatever THE TOTAL DRY WEIGHT IN GRAMS IS OFF OF ALL 12 plants ADDED UP AND THEN DIVIDED BY THE WATTAGE OF YOUR LIGHT EQUALS YOUR GRAMS PER WATT!!! Do you understand that now?
if you have the room to put them in 25 gal containers or larger, then you might get that much off a plant. I have seen Heaths tree grow cheisel and get an amazin yield, but he was also using 4 1000watt lights per plant on a flipflop, think he got a couple lbs of 1 plant but it doesn't sound like you have the light capacity or room for something like that. Look up heaths tree grow on google, you will see what I'm talking about. Indoors plants don't react the same as outdoors. that same plant you got your cutting or seeds from was probably in a 100 gal container or larger, thats why it got so big, if you can recreate something like that then yes you can get a couple pounds per plant. good luck
just looked up heaths for you - 56 oz from one plant using 4 600w hps on a flipflop using the equivalent of 900watts. in a souped up dwc system.