The ultra-compact M300V Scout LightA(R), powered by one 123A lithium battery, produces 250 lumens of brilliant white light or 100 milliwatts of invisible infrared output for use with night vision devices - with no need for IR filters or spare lamps. To switch from white to infrared output, simply twist the self-locking selector ring on the dual-spectrum V-series head. In either mode, the M300V's TIR lens produces a tight beam suited for close- to medium-range applications. The high-efficiency LEDs are virtually immune to failure since there's no filament to burn out or break. The M300V comes with a momentary/constant-on pushbutton tailcap switch. The M300V clamp Mfg: Surefire SPECS: Bezel Diameter: 1.125 Inches, Weight: 4.5 Ounces, Batteries: 1, 123A, Output High White: 250 Lumens, Runtime High White: 1.2 Hours, Output High IR: 100 mW, Runtime High IR: 5 Hours, Tactical Runtime White: 1.2 Hours.