Master All Hostile Environments. The M600IB is the smartest model in the Scout Light family. SureFire’s proprietary IntelliBeam® technology automatically adjusts the LED output between a minimum of 100 lumens and a maximum of 600 lumens, depending on the distance to target. It works faster than the human eye. Wherever the light is aimed, the onboard high-speed microprocessor instantly and automatically adjusts its output to provide optimal illumination for maximum visual acuity. Whatever the light output, a textured parabolic reflector precisely projects a smooth, focused beam with a bright center and plenty of surround light. The M600IB’s tailcap switch provides momentary- or constant-on activation, and SureFire’s proprietary lockout feature prevents unintentional activation. Built to survive the rigors of combat, the M600IB’s Mil-Spec hard-anodized aluminum body, tempered window and O-ring seals make it virtually indestructible.