Ummmm...math error here.
1 cube/day feeding = 12 sq in of screen, not 1
12 sq in of screen/cube/day x 150 cubes = 1800 sq in double-sided screen. That's a 42"x42" screen with 900 watts of fluorescent light per side. Using the minimum LED configuration, you're looking at one 3W on each side of each 4x4 section, or about 110 LEDs per side. You could probably slim that down a bit but we're still talking a friggin monster of a scrubber here.
I can build you that BTW LOL