driven on a 96% efficient Mean Well HLG-600H driver.
It's a bit too big for a 1.2 x 1.2m.
The ultimate design for a 600W Ripper will probably have to change a bit, to make it more suitable for 1.5x1.5m or 2.4 x 1.2m. It would be a good start for a 2.4 x 1.2m.
If you're comparing with an imported 6 x QB288 light on a single heatsink, note that the Ripper covers a much larger area, with an even and more usable PPFD, and runs at least 20°C cooler, since we source aluminium in South Africa, and use 5W/mK thermal paste.
About half the cost of imported lights is the shipping, and so the thin black anodized heatsinks and flat plate heatsinks on Chinese lights typically run at 58°C, because they need to reduce the weight of the fixtures. That high running temperature causes a 10% efficiency drop, according to the Samsung LM301B spec sheet.
The efficiency is approximately 2.7uMol/J. (194lm/W pre driver, 186lm/W post driver) Let us know if there is a better deal in SA.