LED LAMP is a solid state semiconductor device that can be oval or square in appearance, and is composed of grains, package bodies, metal wires, and brackets. The main light emitting part is the grains in the package body. The main component of the package body is epoxy resin, which is used to fix the bracket. The top end can be made into a light collecting lens, which can make the emitted light more concentrated. All light emitting diodes are fixed, with the long ones being the positive electrode and the short ones being the negative electrode, The wavelength of light, which is the color of light, is determined by the material that forms the PN junction.