Already ordered a bottle of Goot Super Soldering Flux and a 100-pack of R330 SMD resistors so, officially:
Cheers
P.S.: after re-checking this testing two of KD's new Nichia 219b leds (4500K'92CRI' and 5500K), seems my expected lumen throughput will be “just doable” with around 2A per emitter. Hope the thing doesn't heats up too much with ≈25W on the emitter board… 