... temperature resistance 4)clear solar concentrator glass lens(GT-D22-10-1)1)material: optical glass(borosilicate),K9,BK7,B2702) light transmittance: ... dirtsb: can match up all kinds of different high power led ,uniform facula,no collapsar,shadow and dark c: adopt ... for big angle spotlight ,cars light,outdoor illumination,stree lamp,flashlight/torch light,wall washer ligh,tunnel light, table light,far ...