0402 LED lamp bead is a very small and lightweight electronic component, usually used in the miniaturized design of electronic products, such as mobile phones, tablets, smart watches, etc. It is mainly used for indicator light, backlight, digital tube packaging and lighting lamps and other aspects, with small volume, low power, high luminous efficiency, strong reliability and other advantages, can help designers in the product to save space, save electricity and improve efficiency and other goals. At the same time, it is often used in scientific research and education, DIY production, artistic creation and other aspects, is widely used in various fields.