The revolutionary SureFire M600IB is the most sophisticated, most innovative member of the SureFire best-selling Scout Light Family. It utilizes SureFire’s proprietary IntelliBeam™ Technology—an intelligent sensor and microprocessor-based system that continuously evaluates the environment where the beam is aimed—to automatically adjust the light output to the optimal level, between 100 and 600 lumens, faster than the human eye can detect. So you always get just the right amount of light for the task at hand, based on your surroundings! Its high-performance LED and parabolic reflector create a smooth, highly useful beam with far-reaching center and significant surround light for maintaining situational awareness no matter to which output level the M600IB’s beam is automatically set.