I am of the opinion that you should aim for about a pound per light as a goal, initially. So for you, with those lights, I would guess more like 48 (3 ounces per plant if there are 16 plants) to 64 ounces.
Your plants are looking great, man! I am at week 7 on my grow, and could not be more excited!
I love the plant with the purple/blue, must be the Widow Berry (Blueberry Widow, or Berry White?), right? I am growing Blueberry Widow in this run also, but not as much purple/blue in them. They get more colorful as they finish, and temps are low.
Also growing Ice, Master Kush, Wonder Woman, White Rhino, and Snow White. Good luck, man! Subbed for the harvest.....better be some good pics! lol