Im looking to upgrade my flowering lights. currently running 2x 300w 2nd gen galaxyhydro units and looking to switch to QB panels. should i still follow the watts/ft^2 method? im thinking of doing a 2.5x2.5 panel with 4-6 QB panels, but im wondering if that would run me into diminishing returns. im looking at the 304 panels right now and would be fabricating the fixture myself or ordering something once it gets back in stock. how many would you guys/gals use for a 3x3?