I have switched to home built aeroponics setup.I did my last grow as a journel.I grow 28 plants in the system room is 8 ft by 8 ft by 8 feet tall.I was using 3 400 watt hps lights but went with 2 600 watt digitals on a light mover with a homemade cross bar to move both lights with 1 mover.I use co2 tank injection.Pulled little over 98 oz wet from last grow at 5 week flower 10 days veg
You'll lose 70-80% of your wet weight during drying and another 10% during curing.
So that gives you a yield of -
98 x 28 2744 grams x 70% = 1920-2744 = 823 and 2195 - 2744 = 549.
823 /1200 = 0.68 grams per watt
549 / 1200 = 0.45 grams per watt
That's not a very good return from 2 x 600 digital ballasts which output more lumens per watt than any other HID lighting system.
The yields you're getting are not much better than many people get with the CFL's and fluorescents you deride so much.
Your yields are
pathetic for the lights you're using.