the invention involves a focusing flashlight , the flashlight includes the tail cover , housing body , and a reflector and a bulb holder installed in the housing body . therein , the reflector and the bulb holder are connected to each other by the threads in order to adjust the position of the bulb . between the reflector and the bulb holder , there is installed a lock device to fix the relative position of the reflector and the bulb holder . the focusing flashlight has a lot of advantages , for example , the focusing performance being reliable , the focusing performance after focusing being unaffected by the rotation of the front cover and the housing head , the structure being simple , and , convenient .