... glass (borosilicate) material 2) above 94% light transmittance 3) high temperature resistance 4)clear solar ... )material: optical glass(borosilicate),K9,BK7,B270 2) light transmittance: 95%( coated lens can up to 97%) ... 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, ...