@captainmorgan by my measure that is 503g/265W = 1.9 gpw. HPS users usually go by bulb dissipation so if they get 1000G from a 1000W HPS they call that 1 gpw, ignoring ballast losses and cool tube fans etc. So must of us think with the benchmark of 1gpw in our minds and you have almost doubled that using soil and a top shelf variety, very impressive!
Another way to look at it, if someone ran 265W of dissipation like yours, passive cooled on an HLG-185H driver and reached 94% efficiency, their total power draw could be as low as 282 Watts. Gavita ballast is 95% efficient and non cooled hoods so those numbers are directly comparable either way.
Does your lamp have reflectors?
What were the average canopy temps during lights on?
9-10 week finish, is that normal for GG#4?