Great choice of emitter and driver.
I ordered some 5amp drivers from Convoy. 12 mode groups. They should be excellent drivers for single emitter setups.
Nichia 519a can handle more current than the 219b, but I’ve known of 3 that have burned up using FET drivers in seconds. So, for me, a conservative 3 amp driver is ideal, with a 5 amp driver being the max.
I can add 3*7135 chips to a QLiTE and get it to 4 amps, which is probably perfect for a single 519a
I remove 7135 chips for the lights I build for my kids. I give them 1 amp QLiTE drivers.