Nightstick TCM-550X, Compact Weapon Mounted Light, 550 Lumens, 2.5 Hour Run Time, IP-X7 Waterproof, Matte Finish, Black TCM-550XL The TCM-550XL Compact Weapon-Mounted Light uses a super-bright LED rated at 550 lumens working in conjunction with a precision-engineered total internal reflection (TIR) lens to create a bright white beam of light rated at 136 meters. This weapon light features completely ambidextrous and intuitive rear-facing toggle switches on each side of the light to operate the momentary-on and constant-on lighting modes.