I’m assuming this will fit the C8 and many S-series lights. 8A is suitable for the SST-40 and SFT40, but will likely be limited by forward voltage with most emitters.
5A is running a 519A, SST-20, etc… fairly hard, while 3A is a pretty average single-emitter light.
Ordered the S6 with CSLNM1 and requested the 5a buck driver for an 18350 pocket thrower, hopefully.
I think that statement might apply to this Osram emitter as well.