Lighting accounts for about 23% of the electricity used in the United States. Of this, 20% is used in homes, 76% in commercial and industrial settings, and the remainder in outdoor uses such as street lighting. In commercial buildings, lighting consumes from 25% to 40% of the energy used, and is a primary source of waste heat, which increases the cooling requirements in these buildings.
Using energy efficient lighting techniques can significantly lower your energy costs, including both the costs of lighting and the cost of air-conditioning. This is generally done using more efficient lights and ballasts (control devices), lighting control systems, and daylighting techniques.
For more information on lighting technologies, see Lighting R&D on DOE's Buildings Web site. In addition, the Western Area Power Administration publishes a two-page fact sheet on efficient holiday lighting options, updated annually — look under Residential Fact Sheets on the Energy Services Fact Sheets page.
The U.S. Environmental Protection Agency (EPA) and DOE collaborate on the Energy Star program, a voluntary labeling program designed to identify and promote energy-efficient products to reduce greenhouse gas emissions. The Energy Star Web site provides useful information on thousands of these products, including lighting.
For additional information, see Lighting and Daylighting on DOE's "Consumer's Guide" Web site.