Even if you had the perfect environment, with a perfect feeding schedule/portion, etc... it would still be at least a bit dependent on the strain. As most people here know, sativa strains will likely not yield as much as a heavy indica yielder. Thus, I don't think you can get 1g/watt no matter what in some cases. I wouldn't be too worried about that, though. Plus, if you had, say, 5000 watts running in your grow room... do you actually think you'd be able to yield 5000 grams wet unless you had plenty of plants? Correct me if I'm wrong, though...