... Focal length: 35mm Good quality HW052350 fresnel lens for led light specificationsDiamter: 52mmThickness: 2mmMaterial: PMMAFacet spacing:0.5mmFocal length: ... optical lens. 1. LED wash wall lamp, floodlight, flashlight, projection table, projection clock, torch light, solar street lamps, ... 180 degrees, high light transmission rate of 99%3. U.S. LUMILEDS-LED special lens, special lens LED Seoul, Korea, ...