Ive seen 350g out of a 80x80 auto tent using only 100w of led light, 6 plants. Not samsung diodes but similar efficiency due to being run very soft and with perfect even spread. Though g/w has become somewhat a silly metric; you can fairly easily crush the numbers with low watts + larger space + autos (+66% light per day moving from 12h flower to 20h cycle). The numbers over 2g/w quoted above are all possible but not so relevant unless correlated to how much yield per area: high g/w with low g/foot is extremely achievable.
- Spectrum in flower was 2700k 90cri + 660/630nm supplemental, lower cct in veg. Somewhat thru anecdote and reading up on the science: the lower intensity of light the more important the spectrum and its impact on yield.
Id say that the grow referenced is possible but unlikely, youd have to have an idea of how far he dries his crop before weighing it in. I would not be expecting this yield if youre starting out growing, its better to be realistic. This is top level performance if all true. Its basicly 3 per light in a 4x4.