The L-Prize competition was designed to spur development of LED light replacements for 60W incandescent lamps and PAR38 halogen lamps as well as an ultra-efficient "21st Century Lamp". It was established by the United States Department of Energy (DOE) as directed by the Energy Independence and Security Act of 2007. The original competition, launched in 2008, focused on an LED replacement for the common 60-watt light bulb and this L-Prize was awarded in 2011. The PAR38 competition was launched but received no entries and was suspended in 2014. The 21st Century Lamp competition was never opened.
The current L-Prize Competition launched in 2021 and targets commercial-sector lighting, which accounts for about 36% of lighting energy use in the United States.