Nightstick TWM-852XL, Tactical Weapon Mounted Light, 850 Lumens, 1.75 Hour Runtime, IP-X7 Waterproof, Matte Finish, Black TWM-852XL The TWM-852XL Tactical Weapon-Mounted Long Gun Light uses an LED rated 850 lumens for 1.75 hours providing a beam distance of 245 meters. The rear-facing single switch provides both momentary and constant-on lighting operation. Designed to securely attach to a long gun Picatinny rail" the IP-X7 rated waterproof housing is constructed from aircraft-grade 6061-T6 aluminum.