Material :BK7 K9 Borosilicate glass Product name: Led lens for 5100W with reflector Quality : clear and transparent , no bubble and impurity inside. Light transmittance : 93~94 Working temperature : 50~550 ?Focus length: 30 Application: 20W 30W 50W 60W 80W 100W high power LEDBeam angle: 60 90degree GW:39gPCSSpecifications:Viewing angle: 6090 degr...