Thanks for the compliments 
I installed one on them in a PL09 Quad with sliced 519A and AUX LEDs :
I transformed the MCPCB to 2S2P by cutting the trace between D2 and D3 (the line on the right is just some removed soldermask) and by creating another solder pad for the + wire :
I used a flex PCB I made for the FWAA before because I didn’t want to wait for a proper one made for the PL09, hence there are only 3 LEDs :
Though once the optic is on it’s not obvious where is the missing one :
Min level (70uA), could be lower with some tweaks but it’s low enough IMO :
Color measurements on level 7 (0.75A per LED) and turbo (3A per LED):
I’m very satisfied how it turned out, I really like this host and the beam is like pure neutral white for me.