According to the source, projections for cool white packages assume CCT=4746-7040 Kelvins and CRI=70 -80.
The abbreviation CCT stands for color correlated temperature; the abbreviation CRI stands for color rendering index.
This statistic shows the projected efficacy of cool and warm white light-emitting diode (LED) lamps in the United States from 2010 to 2020. In 2012, it is estimated that warm white LED lamps will have an efficacy of *** lumens per watt.
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U.S. Department of Energy. (July 29, 2011). Projected efficacy of LED lamps in the United States from 2010 to 2020, by lamp type (in lumens per watt) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved August 02, 2026, from /statistics/216358/efficacy-of-led-lamps-in-the-us/
U.S. Department of Energy. "Projected efficacy of LED lamps in the United States from 2010 to 2020, by lamp type (in lumens per watt)." Chart. July 29, 2011. ÌÇÐÄÆƽâ°æ. Accessed August 02, 2026. /statistics/216358/efficacy-of-led-lamps-in-the-us/
U.S. Department of Energy. (2011). Projected efficacy of LED lamps in the United States from 2010 to 2020, by lamp type (in lumens per watt). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: August 02, 2026. /statistics/216358/efficacy-of-led-lamps-in-the-us/
U.S. Department of Energy. "Projected Efficacy of Led Lamps in The United States from 2010 to 2020, by Lamp Type (in Lumens per Watt)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 29 Jul 2011, /statistics/216358/efficacy-of-led-lamps-in-the-us/
U.S. Department of Energy, Projected efficacy of LED lamps in the United States from 2010 to 2020, by lamp type (in lumens per watt) ÌÇÐÄÆƽâ°æ, /statistics/216358/efficacy-of-led-lamps-in-the-us/ (last visited August 02, 2026)
Projected efficacy of LED lamps in the United States from 2010 to 2020, by lamp type (in lumens per watt) [Graph], U.S. Department of Energy, July 29, 2011. [Online]. Available: /statistics/216358/efficacy-of-led-lamps-in-the-us/
