The Led Lenser H8R Rechargeable Headlamp is the perfect DIY and outdoor light that produces up to a massive 600 lumens! Due to the intelligent and completely automatic termperature control, the H8R never gets too hot, no matter how much you use it! The smart light technology allows you to program your light functions to the task at hand. The three light functions (dim, medium and high) are easily operated with full or half clicks. Galileo swore by the power of lenses, Newton swore by reflectors. Led Lenser have combined the two to create the Advanced Focus System! This technology allows a seamless transition from homogeneous low beam to a sharply focused high beam.