Average indoor yeild?

I was just wondering what people are yielding growing indoors and with how many plants? I don't kno if i need to expect 2 grams, 20 grams, or 200 grams?

here is a pic of my setup and a single plant...any ideas of what it will yeild?

i'm using a 250w hps to flower, it vegged for 25 days under cfl's and 6 days under a 250w metal halide. i started flowering today, i gave it its first nute shot last watering with a high nitrogen content (i don't hav anything else yet.)

Depents on the strain, and alot of other factors! I would say the most you will get from a 250 would be an oz with a plant that size. Probably less!