So that means you have 2 LST'd plants, and 4 untamed under a 400w HPS.... That's a pretty good size for the plants... I don't see why you couldn't get 1 gram per watt. I'd guess off each plant, you're looking at anywhere from 2-1/2 OZ - 4 OZ(amazing if so).
So my guess, is 15 OZ, give or take an OZ.
So my guess, is 15 OZ, give or take an OZ.