In the field of scientific research, optical lenses are used in many optical instruments, and optical lenses are made according to the refraction law of light. A lens is an optical element made of transparent material. The lens is a refracting mirror, whose refracting surface is a transparent body of two spheres (spherical part) or a sphere (sphere part). It looks like a real images also have virtual image. Lenses can be divided into two categories: convex lens and concave lens. The central part than the edge portion of the thick called convex lens, convex, concave, convex is three; the central part than the edge part called thin concave lens, plano concave, convex and concave, a double three.
At present, LED lens is usually a acrylic lens, because of its high light transmittance, design and molding are easy to control, high production efficiency characteristics, so the application is more common. The general LED lens are to light for the two time, it is helpful to improve the optical efficiency of LED, LED lens changes the optical field distribution of optical lens and LED LED system is closely linked with the help to improve the LED optical system with optical field distribution of optical efficiency, change the LED. High power LED lens / reflector cup is mainly used for concentrating light and guiding light of high power LED cold light source series products. The high power LED lens designs the light distribution curve according to the angle of the exit light of different LED. By increasing the optical reflection, the light loss is reduced, and the light effect is improved (and the aspheric optical lens is set).
Design of optical lens in front with a penetrating light, and the conical surface can also be collected and all side light is reflected, and the two light overlap can be the most perfect use of light and beautiful spot effect. At the same time, some changes can be made on the surface of conical lens, which can be designed as mirror surface, frosted surface, bead surface, stripe surface, thread surface, convex or concave surface and so on, and obtain different spot effect.

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