@Daddy 2g per is pretty ambitious. I think it attainable, but everything about your grow is going to have to be yield oriented. High yielding strain, from clone of a high yielding pheno, max nutes probably all the way to chop, high plant count, and absolutely not a single hint of a problem.
On top of that, simply having Cree or big name diode won’t be enough. You’ll need to be running them at low currents to keep them uber efficient, probably have something like 6-8" spacing on center to keep par levels up, and be adding co2.
While again it’s maybe attainable, we’re talking serious build cash! More importantly, it’s not the direction the majority of people here seem to be looking. At least from an investment standpoint. I’d love to help spec something like that, but I would have a hard time convincing anyone that’s the route best suited for them. For 30-50% of the cost we can go with a medium current and 10-12" cob spacing and target the 1-1.5 gpw range doing about the same things without co2.
I think when you look at the trends here, the masses are chasing more quality over quantity. It’s not that you can’t have both, but growing a personal stash is a lot different than a commercial cash crop. The members here are doing things like starving nutes at the end of their grow, slow drying, and targeting long cure. Not the typical things you would do targeting weight. But the more experienced growers seem to still be in the neighborhood of a g/watt with amazon fixtures. I’d say that’s pretty outstanding! In fact, there’s a couple i’d probably loan a light to just to see what they could do with it.