1) optical glass (borosilicate) material 2) above 94% light transmittance 3) ... resistance 4)clear solar concentrator glass lens(GT-D22-10-1) 1)material: optical glass(borosilicate),K9,BK7,B270 2) light transmittance ... /torch light,wall washer ligh,tunnel light, table light,far-infrared monitoring light,infrared light,pool light, stage light, projector light,optical instrument ...