This lens uses two compound lenses, which vary in angle from 10 ° to 50 ° at a very short focusing distance(6 mm). At the same time, the lower half of the lens is reflected Fresnel lens, precision injection, away from the light source. At the same time, it has the function of matching the light source and focusing. In practical application, the size of the lamp can be made very short, and then through lens focusing to get different sizes of angle, wide application, convenient design.