... 4.Light efficiency: 95% 5. Material: BK7 glass Name: Led lens ,glass lens,street lamp lens,optical lensDiameter&Size: 5mm ... (un-coated)Lens type: aspheric lens,spherical lens,special lens for street lamp,underwater lamp and industrial lamp,etcApplication: Auto lamp ... ,medcial lamp,led spot light,led down light and all lighting field.For more,please send us inquiry to know it better high power led lens