Streamlight PolyTac LED Flashlight with THORNTAIL Adaptive Light Mount C4 LED technology within a parabolic reflector produces a concentrated beam with optimum peripheral illumination Attaches to any Picatinny /Mil Spec or Weaver Rail High for bright light: 275 lumens; 9,500 candela; 195m beam distance; runs 3 hours Low for when less light is needed and for longer run times: 14 lumens; 500 candela; runs 65 hours Strobe for disorienting or signaling: runs 5.5 hours Solid State power regulation provides maximum light output throughout battery life High impact super tough nylon polymer for exceptional durability and a sure grip