led panel light
LED: Technology for energy-efficient, flexible lighting solutions

Source: Osram

Basic principle of a LED (light emitting diode)

A light emitting diode consists of multiple layers of semi-conducting material. When the diode is being used with direct current, light is produced in the active layer. The light produced is decoupled directly or by reflections. In contrast to incandescent reflector lamps, which emit a continuous spectrum, an LED emits light in a particular color. Read more