... temperature resistance 4)clear solar concentrator glass lens(GT-TYN01/01/03)1)material: optical glass(borosilicate),K9,BK7,B270 2) ... precisy aspheric design and superior optical glass, strictly perform ROHS environmental standard5) application range: suitable for big angle spotlight ,cars light,outdoor ... light, projector light,optical instrument,astronomical instrument. solar concentrator glass lens