How do LED Grow Lights Work?
Most simply, LED lights use a current passing through a semiconductor to produce light. The energy (in the form of light) is released from moving electrons inside the semiconductor. They used to only be available in the red, but now they are available in any color, ranging from ultraviolet to infrared wavelengths. The invention of LED lights is credited to H. J. Round, a British man from Marconi Labs who, in 1907, was the first to experiment with, and observe electroluminesce