Don’t have that flashlight, don’t recall, but I learned about it somewhere on MTBR and they know suppliers that are reliable for the whole range, that’s just one of a variety of optics.
Hmmm, maybe ’oogle: yep:
https://www.google.com/search?q=carclo+s2+s2%2B
Use the lens to replace the relfector of Convoy S2+ flashlight <= here ya go