It would need to be an EDC sized light, LED, IP68 rated, min 1m drop rated, small enough to be used as a headlamp, multi-fuel power, good UI w/shortcuts or programmable, low at or around 1L, at least a real 4hr run time at 60L; 100L would be better, real 10L at 25yds beam, CRI of 90 or better. Of the lights I have at hand my Acebeam TK16 comes closest with a Streamlight 1L aa, Olight S2R Baton II & Acebeam TK18 in the mix. But I kinda like the TK18 a bit better than the TK16. Truth is all 4 are very very good lights