11w/ft² Definitely not optimum at all. Was extremely surprised tbh. Kinda changed my tone a bit after that.
I get all out of joint now when people claim a mars fc-4800 is the reason they aren't yielding enough in a 4x4....meanwhile my plants grown under half the light yield better.
you're on the same page as me, in general, I think most LEDS on the market are not very practical, the light spreads is not even, and their too powerful, so most growers end up turning them down, wouldn't be great to buy an led for a 4ft x 4ft flower room(800par) light spread covering the whole room very even 12" above the canopy, full power. should be able to do this with 320w, (20w ft2) (high quality led)
That's why I am building my own, results speak for themselves.