I think you are right, similar to lume1 driver I guess. Unfortunately, I already re-assembled it with gorilla glue since there is no retaining ring :person_facepalming:
In any case if you compare my picture with Kawi’s picture of the Manker MC13 it looks like they re-used the same driver but where that component is that’s missing on his picture is present in my picture, but hidden. I actually considered taking another angle pic but I (wrongly) assumed a similar picture already existed. Given what we know about the lights (MC13, no direct drive mode) I think some type of FET is a good guess for that component.