A method of deposition of magnetic nanocomposites. The LED lamp includes an envelope, a first heat sink enclosed by the envelope, a plurality of LED modules mounted on the first heat sink, and a pair of second heat sinks. A terminal for a reference voltage is connected to a control terminal of a second input transistor. 2 or less, a coverage rate of the protrusions on the surface of each toner base particle is 10% to 90%, and the external additive includes an external additive which is fine inorganic particles each containing silicone oil. The computing device is coupled to the reader and one or more of the auto login server and tracking server. The second p-type layer contacts the light emitting part.