... 4)clear solar concentrator glass lens(GT-D22-10-1)1)material: optical glass(borosilicate),K9,BK7,B2702 ... adopt high precisy aspheric design and superior optical glass, strictly perform ROHS environmental standard6) application ... table light,far-infrared monitoring light,infrared light,pool light, stage light, projector light,optical instrument,astronomical instrument. solar concentrator glass lens(GT ...