Fluorescent light source In a fluorescent light source, the electrical current excites mercury vapor, which produces ultraviolet radiation, and excites…
Solar LED Street Light Street lamps generally use high pressure discharge lamps such as high pressure sodium lamps or mercury…
High efficiency LED is a current driver, which requires current limiting when the voltage source provides current. In most applications,…
Constant current drive circuit When evaluating LED lamps, LED driving circuit is an important factor. Many simple drive power supplies…
The current-voltage characteristic of an LED or ordinary diode can be decomposed into four regions (see Figure 1), two in…
In 1962, Holonyak and Bevacqua, who worked at GE in New York, USA, took the lead in producing visible light…
An LED is a polar device that emits light when applied with an appropriate amount of direct current. Generally, LEDs…
Materials can be divided into three types according to their conductivity. Some of these materials that conduct electricity well are…
1. IrradianceIrradiance is a measure of radiation. It is used to measure the electromagnetic radiation energy per unit area. Its…