The SureFire LM1 LED/TIR lens conversion assembly replaces the original incandescent or LED reflector-type head and battery housing of SureFire 600-series and 900-series dedicated forend WeaponLights, such as Shotgun Forend WeaponLights. The result is an extremely compact head/housing unit, powered by one 123A battery that generates 500 lumens of brilliant white from a virtually indestructible LED emitter. The TIR lens produces a more concentrated, farther-reaching beam for close- to mid-range engagements. Provides a one-hour runtime, per battery, with gradually decreasing output afterward. Constructed of aerospace aluminum with a Mil-Spec hard-anodized finish, the LM1 is O-ring sealed for reliable operation in all weather conditions