Flashlight design is neither my hobby nor my profession. But I own a bunch of flashlights, and single-button dimming seems to be table stakes for a lot of comme

Flashlight design is neither my hobby nor my profession. But I own a bunch of flashlights, and single-button dimming seems to be table stakes for a lot of commercially available head lamps and lanterns. Also, with the right micro, a second button (with relevant environmental protection) may well be more expensive than putting that micro and voltage regulator under a big blob of black epoxy.