Several LEDs Surpass 100 Lumens per Watt
Improvements in lighting technology for LED bulbs have increased lighting efficiency, or efficacy, according to the Energy Information Administration, which says in September of this year, several manufacturers released EnergyStar-qualified bulbs surpassing 100 lumens per watt. For comparison, traditional incandescent bulbs, which do not meet current light bulb efficiency standards and are no longer sold, provide 13 to 18 lumens per watt.
Shipment data collected by Energy Star show that LED bulb shipments have increased from about 9 million bulbs in 2011 to more than 45 million bulbs in 2013, reaching an estimated 2.3 percent market share of general service lighting. Shipments of CFLs have been about 300 million annually since 2011, with an estimated market share of 15-20 percent.
The Department of Energy’s Solid-State Lighting Program has encouraged research and development of solid-state lighting, primarily LEDs, and promoted consumer education as the market evolves. The Lighting Facts label that appears on almost all light bulb packages provides information on the brightness (in lumens), power draw (in watts), efficacy (lumens per watt), assumed lifetime, and estimated annual energy costs.
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