API can provide the material with optical grade transparency, durability, high temperature resistance and design freedom. These optics include first optics, secondary optics, convex lens, thin lens, micro lens and so on. Currently the technology of high power Micro LED、Mini LED are facing new challenge. Keeping the optimized performance are needed for the new generation of LEDs, also the tiny package can be applied for micro structure design. Correspondingly, optical silicone is the right material to provide optical transparency, durability and design freedom.