Greengenes Garden talks bout the Fluence chips in a couple a his youtube channel tech talks. Think its top bin sammies n crees. No special sauce. Same fer the drivers.
Member that Fluence SPyder 2p is a big fixture 42 x 47 so the same large dims as nething youd build yerself. Problem is its 3-4x the price of yer own build.
Last gen Bridgelux EB2 is approx same eff. as last gen Sammy LM501c from all the gonio n sphere results I seen which is 5-7% lower than current gen top end. And Digikey got them EB2 4fters back in stock fer cheap rite now!
Compared to the Spyder 2p at $1300ish delivered, u can build yer own DIY 12x of 4ft EB2 3500k usin 6 each mounted on a 2x4 angle alum frame (every strip on its own angle alum cross piece for rigidity) each fixture usin 1 of the 2 outputs from the MW HLG-480-42ab. Total cost round $400 USD delivered all-in for 525w at the wall which is perfect fer a 4x4. Efficiency is 2.2 - 2.3 um/j range. Higher end if u use 240v electric.