Thanks!
Yeah, it's a friends light and he got it as a gift himself. Thus, why I don't know.
what's a 3S converter, the tailcap?
what lumens are runtime are on a XP-G emitter?
This light doesn't have a separate tailcap, the McClicky switch threads directly into the body. The "3S" is the driver/converter name, and is a 3-mode (3 Speed) driver. Per the original thread on this light, looking at about 185 lumens with the XP-G, and about 50 minutes before significant drop in output on high with a fresh CR123.