Welcome to ETC Educational Technology Connection (HK) Ltd!
A light-emitting diode is a semiconductor element that transmits light. The abbreviation is LED. This is the abbreviation for “light-emitting diode.” When electrical current flows through the diode, it emits light. The wavelength (light color) depends on the semiconductor material and abatement. The LED emits white light. The light barrier LED is used as a transmitter for a light barrier.