My favorite 16340 is an Aspheric Utorch S1 Mini, modded to 2000k and 4500k Nichias
Aspheric Lenses are outstanding for close range and HatLamp use
I include an RRT-01 for the infinitely variable UI, the lowest low, and highest high (destined for a High CRI LED swap)
I include a Novatac, for the small hotspot, and Programmable brightness modes (destined for a High CRI LED swap, that will also triple the max brightness)
I have a couple of 16340 lights but for months I’ve been carrying a 4000k triple modded D25c ti (2017 version) with single led lighted tail. Occasionally I need something with a little more throw but the size, feel, tint etc… it’s been hard to find a new fav