The garden here has 5400 watts in an 9' x 7' area. A good harvest runs about a pound and a half per month, and a poor harvest yields about a pound per month.
Either is less than your goal.
When younger I ran 7000 watts and yielded two pounds per month, closer to your goal.
After 17 years of gardening the total average is just over a pound per thousand watts, taking two months to move five plants through the bud room. These have always been gourmet buds rather than high yielding strains. How much difference that makes I could not say, other than a gardener down the road gets more than half again as much, three pounds per month, using lower grade high yield strains with almost identical wattage.
This is in a five plant perpetual with a harvest every 11 days, if all five were put in at the same time it would take two months to harvest almost six pounds of bud all at once.
Too much work, spreading it out is less stressful and easier to trim and cure.
Oh yeah, the sprouting table is 600 watts, the veg table is 1000 watts, both necessary to ready the plants for the bud room.
Veg and bud plants get 1000 watts per plant, less gives less quality. The sprouts get less, included is a picture of a sprout in a container of 8" plants almost ready for the veg table.
The plants get advanced every eleven days, only one veg at a time and three sprouts. The five budding plants were already mentioned. Schedules need planned out three months in advance to run smoothly without missing any harvest.