The SureFire LM2 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 two 123A batteries, that generates 1,000 lumens of brilliant white from a virtually indestructible LED emitter. With a TIR lens that produces a concentrated, far-reaching beam for close- to mid-range engagements, the LM2 provides more than one hour of runtime, with gradually decreasing output afterward. Constructed of aerospace aluminum with a Mil-Spec hard-anodized finish, it's also O-ring sealed for reliable operation in all weather conditions.