1.the lampshell and the bracket are aluminum casts,with their exteriro surface plastic-sprayed.it has high tenacity and is endurable. 2.the lamp-chimney uses PS of high purity and transparency.it is resistible to ultraviolet radiation, static,high temperature, and wallop.Beside, it never turns yellow. 3.reflector gets molded by mirror aluminum ,and is awarded"the best design of light matching" 4.the protection level of the lamp is IP65 while the shock protecting measures falls into 2 category.