How do LED Lights Work? LED grow lights produce light by passing a current through a semiconductor material, which in turns moves electrons thus creating light. The semiconductor material has a p-n junction, which is the section of the boundary. This is known as the active zone where the electron action takes place. The color of the light is emitted or its wavelength is dependent on the energy between the p and n materials. The advantages that the LED lights have 1. The LED lights are cheap ...