Nightstick TWM-854XL, Tacical Weapon Mounted Light, 850 Lumens, 1.75 Hour Runtime, IP-X7 Waterproof, Matte Finish, Black, Includes Remote Pressure Switch TWM-854XL The TWM-854XL Tactical Weapon-Mounted Long Gun Light with Remote Pressure Switch uses an LED rated 850 lumens. Working in conjunction with a high-efficiency deep parabolic reflector it creates a usable beam of light rated at 245 meters. This weapon light attaches to a Picatinny Rail of a long gun to operate the momentary-on or constant-on lighting modes.