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This content will become publicly available on December 28, 2018

Title: LED lighting efficacy: Status and directions

A monumental shift from conventional lighting technologies (incandescent, fluorescent, high intensity discharge) to LED lighting is currently transpiring. The primary driver for this shift has been energy and associated cost savings. LED lighting is now more efficacious than any of the conventional lighting technologies with room to still improve. Near term, phosphor converted LED packages have the potential for efficacy improvement from 160 lm/W to 255 lm/W. Longer term, color-mixed LED packages have the potential for efficacy levels conceivably as high as 330 lm/W, though reaching these performance levels requires breakthroughs in green and amber LED efficiency. LED package efficacy sets the upper limit to luminaire efficacy, with the luminaire containing its own efficacy loss channels. In this paper, based on analyses performed through the U.S. Department of Energy Solid State Lighting Program, various LED and luminaire loss channels are elucidated, and critical areas for improvement identified. Beyond massive energy savings, LED technology enables a host of new applications and added value not possible or economical with previous lighting technologies. These include connected lighting, lighting tailored for human physiological responses, horticultural lighting, and ecologically conscious lighting. Finally, none of these new applications would be viable if not for the highmore » efficacies that have been achieved, and are themselves just the beginning of what LED lighting can do.« less
 [1] ;  [2] ;  [3]
  1. Dept. of Energy (DOE), Washington, DC (United States). Solid State Lighting Program; SSLS, Inc., Johnson City, TN (United States)
  2. Dept. of Energy (DOE), Washington, DC (United States). Solid State Lighting Program; LED Lighting Advisors, Santa Barbara, CA (United States)
  3. Dept. of Energy (DOE), Washington, DC (United States). Solid State Lighting Program; Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Report Number(s):
SAND-2017-9595J; SAND-2018-7339J
Journal ID: ISSN 1631-0705; PII: S1631070517300932
Grant/Contract Number:
AC04-94AL85000; FE0025912; M615001899; NA0003525
Accepted Manuscript
Journal Name:
Comptes Rendus. Physique
Additional Journal Information:
Journal Volume: 19; Journal Issue: 3; Journal ID: ISSN 1631-0705
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Building Technologies Program (EE-2J); USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; Light-emitting diodes; Solid-state lighting; Energy efficiency
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1465180