... 1)1)material: optical glass(borosilicate),K9,BK7,B2702) light transmittance: 95%( coated lens can up to 97%) 3 ... can match up all kinds of different high power led ,uniform facula,no collapsar,shadow and dark c: ... 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 ...