Had to pull out the old notes but anyway WW from seed 6 weeks veg 8 weeks flower produced 62 grams of dried bud on average...lowest was 46 grams highest was 75 grams......from clone 4 weeks veg, 8 weeks flower produced 36 grams average per clone--lowest was 24 grams highest was 43 grams.
All of the plants were flowered under a 1000 watt sodium and were pretty crowded with other strains, probably could have produced a lot more but never kept the strain to find out.
Don't know what kind of light you have but if it's anything like a 400watt sodium vapor with the needed red spectrum you're good...if you grow at least 4 weeks veg then flower you should make an ounce per plant from seed. Different white widows from different sources will produce varying results I'm sure.