... PMMAFacet spacing:0.5mmFocal length: 35mmThe LED lampshade, its principle of work is :1. because the LED point lamp-house shine ... fresnel lens, causes the light the transmissibility compared to traditional high of many, its weight is smaller than condenser, may various ... lens, high temperature above 180 degrees, high light transmission rate of 99%3. U.S. LUMILEDS-LED special lens, special lens ...