... of 100000 hours 6 years warranty Name: Led lens ,glass lens,street lamp lens,optical lensDiameter&Size: 5mm to 120mmMaterial: BK7 ... Glass ,PMMALight Efficiency: >97% (un-coated)Lens type: aspheric lens,spherical lens,special lens for street lamp,underwater lamp and industrial lamp,etcApplication ... spot light,led down light and all lighting field.For more,please send us inquiry to know it better ...