how much could this yield? WHITE WIDOW

MY FIRST BIG CROP. 20 plants, all fem. WHITE WIDOW, haze, crystal, and new york power diesel. 1200 watts of light. 35 sq. ft area. 85 degrees. 45 % humidity. bc grow and bloom nutes. soil grow 3 gallon pots. 6.9 ph. vegged for 3 months till flowering is forced. how much bud could i get?

.5 gram per watt, so 600 grams total or about a pound and a half. You could get more, or less, depends on a lot of factors, but 1.5 pounds is pretty doable.

what kind of lights do you have ? not just total watts.

2 400 watt hps and 10 t8 bulbs 35 watts apiece

about 16 oz.

Thats a conservative estimate. Like was said earlier, too many factors to say. But You could expect 1lb or a little more. A lb should be doable with the HPS alone. So I'm thinking the T5's should get you over that mark, good luck.