Someone was asking me for an IP68 rated flashlight (which can be attached to a headstrap) or headlamp that can be used underwater, maybe up to 3 meters depth.
Max lumens wasn't mentioned but I suppose something like 500-1000 lumens or so would be acceptable.
And if there are any entry-level options (maybe there are some inexpensive flashlights that can already handle up to 3 meters depth)?
Preferably not too bulky (so either 1x 18650, 1x 21700, or maybe up to 1x 26650).