SureFire KX4 LED Conversion Head Hard Anodized Type II Black Max Output: 120 lumens; Tactical Runtime: 2-3.3 hours, depending on flashlight model Virtually indestructible LED regulated to maximize output and runtime Precision micro-textured reflector creates smooth, optimized beam Simply remove the bezel and P60 or P61 emitter currently installed on the flashlight and screw on the KX4 LED head to convert. Max Output: 120 lumens; Tactical Runtime: 2-3.3 hours, depending on flashlight model