With the dual functions of bicycle light and flashlight, the Luxo I-109 boasts a tool-free attachment and easily removable bracket, making it a favorite of outdoor enthusiasts looking for convenience. Round plastic o-rings give the Luxo a high degree of water resistance. The reflector angles are calculated precisely to provide optimal lighting for a wider and longer beam. The precise angles also help eliminate flashing, increasing the safety for road users. All this and environmentally-friendly, too -- a single 1 Watt LED is used to produce the lighting brightness of 8-10 lux.