... % light transmittance 3) high temperature resistance 4) clear Glass lens for LED flashlight GT-D28-5-1)1)material: optical glass(borosilicate ... ),K9,BK7,B2702) light transmittance: 95%( coated lens can up to ... : suitable for downlight and other led lighting. plano-convex glass lens for flashlight(GT-D28-5-1)