Everyone seems to be forgetting one thing with respect to quantity and plants and yield.
MORE PLANTS = shorter veg time = same yield
LESS PLANTS = longer veg time = same yield
If you grow 4 plants under a 1kW lamp or 16 or 32 it doesnt matter. You simply have to make sure the top of the 16sqft canopy is all green. If you have light that goes to the floor, you are losing your yield.
The magical "grams per watt" is really an indicator that you have everything dialed in properly with respect to the environment, lighting, nutrients, temperatures, humidity, plant vigor, etc etc etc....
Under a 1000 watt lamp you should be capable of getting approximately 2 Lbs every harvest, which translates to about 900 grams give or take.
If you arent, you either have growing condition issues, or a weaker strain. That's it.
Then you *and* your medicinal growers need a good educator. The day I pull 16oz or less from a 1kW lamp is the day I quit growing.
BTW -- That's for the +rep with the comment "You are a fucking idiot.....". I'm glad you gave me a + when you really thing I'm a turd. It's OK -- just keep an eye on my grow journal and you'll see it turn 2 Lbs per light.
Ok, so tell us where all of us are wrong? Tell us what are these fallacies that we've conjured up? Not looking for drama, but please, give advice not "yall suck" posts.
Its 16sqft yes, but again, it isnt about how many plants as much as ensuring your canopy is green.
Good luck!