... high temperature resistance 4) clear Glass lens for LED car lamp(GT-) 1)material: optical glass(borosilicate),K9,BK7,B270 ... for big angle spotlight ,cars light,outdoor illumination,stree lamp,flashlight/torch light,wall washer ligh,tunnel light, table light ... ,far-infrared monitoring light,infrared light,pool light, stage light, projector light,optical instrument,astronomical instrument.