... 5-120mm 4.Light efficiency: 96% 5. Material: BK7 glass Name: Led lens ,glass lens,street lamp lens,optical lensDiameter&Size: 5mm to ... 120mmMaterial: BK7,Borosilicate Glass ,PMMALight Efficiency: >97% (un-coated)Lens ... on car,head lamp, street lamp,medcial lamp,led spot light,led down light and all lighting field.For more,please ...