November 4, 2014 Source: EIA, based on Department of Energy’s Note: Reflects Lighting Facts database through November 3, 2014. Improvements in lighting technology for light-emitting diode (LED) bulbs have increased lighting efficiency, or efficacy, as well as color quality. In September of this year, several manufacturers released ENERGY STAR®-qualified bulbs surpassing 100 lumens per watt. […]