SureFire KL5A LED Conversion Head [ 100 Lumens/5 Hours ] KL5A-HA-WH Fits SureFire 6P, C2, G2, G2Z, M2, Z2 Max output: 100 lumens; Total runtime: 5 hours Solid-state LED has no filament to burn out or break; lasts thousands of hours Construction: Type III hard-anodized aerospace-grade aluminum, tempered Pyrex window, O-ring sealed for weatherproofing Digital regulation ensures consistent light output; doesn't drop off like an unregulated LED