Light-emitting diode (LED) is right now the most energy-efficient lighting technology available for use in commercial and business purposes, and it is only natural that it is also one of the most rapidly-developing technologies. LED is a kind of solid-state lighting where a semiconductor converts electricity to light (without producing heat) usually in a small area of about 1 square millimeter or less (the diode). So in an LED lamp, there are actually multiple light-emitting diodes. The light that generates from an LED projects in one direction, which does away with the need to use diffusers and reflectors.