I really don’t want to be “that guy” right now, but considering the pace of this project so far, would it be too late to consider re-polling LEDs to vote on replacing the Samsungs with Luminus SST-20-W 95CRI ?
They have 3000k and 4000k options available, if not others as well. Djozz and Maukka have tested these with amazing results. Better tint and CRI than the Samsungs (less green, better Rg values) and they will throw much better as well. CRI and tint of these compete with E21A 9080s with output in the same ballpark as 219C but definitely shy of LH351. Current vs Vf curves are almost the same between the LH351 and SST20 so current draw will likely be similar.
The emergence of these LEDs have got me extra excited/impatient for the F3WA. :disappointed: