Olight S1R II/S2R II if you don’t mind* horrible CRI and tint (has tail magnet). Emisar D4V2 with raised switch ring or Lumintop EDC18 (has tail magnet or option for it).
FW3A if you don’t mind using electronic lockout the WHOLE time because you WILL get accidental pocket switch activation and melt yourself (no tail magnet).
I’d recommend the smaller 18650 zebralights, like SC64-series. The UI is different, but very convenient once you’re used to it. Also very compact for an 18650 light.
YLP Unicorn 1.0 is a good choice for a much lower price point, and not quite as compact.
I can’t recommend the FW3A or FW1A due to issues I experience with pocket activation. The FW1A is also a bit long and the FW3A doesn’t satisfy “doesn’t melt itself into a puddle of liquid metal and plastic, and can take a bit of a beating.”
To go smaller we have to change battery types. 18350, 14500, 16340. If you can stand to carry a compact 18650 light then it’s likely not worth the tradeoff, because all of those battery sizes have worse energy density.
Yeah, right. Because 1100 * 5 = 3300.
30% space saving is more like it.
Both numbers for 18350.
And one benefit of many 18350 lights is that if you predict that you’ll need more energy (f.e. weekend out) you can just swap the tube and put 18650 inside.