The U.S. Department of Energy (DOE) has released a report detailing the characteristics of the U.S. lighting market by technology and sector. The report, entitled the “2010 U.S. Lighting Market Characterization,” provides comprehensive and detailed estimates of the national inventory of installed lamps as well as their associated energy use and lumen production. It focuses on four sectors: residential buildings, commercial buildings, industrial buildings, and outdoor.
According to a DOE email announcing the release of the study, in 2010, lighting accounted for approximately 700 terawatt-hours (TWh), or roughly 19 percent of the country's total electricity use. Nearly half of that energy use (349 TWh) came from the commercial sector, which was dominated by fluorescent lighting. Although the residential sector (175 TWh) contained far more installed lamps, most of them incandescent, these residential lamps did not see nearly as much daily use, on average, as did commercial-sector lamps.
Since 2001, the average system efficacy of installed lighting increased from 45 lumens per watt in 2001 to 58 lumens per watt in 2010, due mainly to a move from incandescent to compact fluorescent lamps in the residential sector, and from T12 to T8 and T5 fluorescent lamps in the commercial and industrial sectors. The total number of lamps installed in U.S. stationary applications grew from just under 7 billion in 2001 to more than 8 billion in 2010, with most of this growth occurring in the residential sector.