AceBeam UC15 - 1000 lumens - CREE XP-L, XP-E2 & Nichia 276A LEDs - AAA x2 or 10440 x2
Nitecore MH12SE - 1800 lumens - Luminus SFT-40-W LED - 21700 x1
Klarus G15 - 4000 lumens - CREE XHP70.2 P2 LED - 21700 x1