It depends on the plant, and how its grown.. Off of one plant i got just over an ounce, nothing amazing...
somewhere between .4 and 1 gram per watt of HPS is a good range to shoot for. but u asked this question in the outdoor growing. so it could range from moldy bug infested 1/8th to 2 lbs of lush
I was planning on trying to grow some white russian clones this summer wondering if anybody had any info to help