Thank you for the response. Nothing specialized. Just a rugged, 1x18650 (or 1x26650) single emitter general spotter with good reach and useful spill, that can pump out 90k+ CD, constant, for an hour or more, with no stepdown. It would be great to also have 2 lower levels, one that can pump out 40k+ CD, constant, for 2+ hours and another 10k+CD constant for 6+ hours. IPX68. 2m drop rating. Below 6000K in CCT. For a fancier version of the light consider an additional high CRI emitter near the top of the reflector for a flood beam for closeup applications.
I would use such a light for caving, underground inspections and visual evaluations (storm drains, culverts, utility tunnels, etc..), and hiking, but I imagine it would also be suitable for many other applications.
I think the size of the TK32 is an ideal platform to build on for the performance and functions I'm suggesting.