This document discusses energy efficient lighting and provides a brief history of light and lighting technologies. It describes early lighting methods such as fire and torches. Modern technologies discussed include compact fluorescent lights (CFLs), induction lighting, and LED lighting. These new lighting methods use 40-60% less energy than traditional incandescent bulbs and last much longer. The document provides examples of energy efficient lighting being used for street lights, signage, and other applications. It emphasizes that switching to energy efficient lighting can provide significant energy savings.