The item “White LEDs Poised for Global Impact” (Physics Today, Physics Today 0031-9228 60 12 2007 25 https://doi.org/10.1063/1.2825062 December 2007, page 25 ) provides an interesting account of the use of LEDs in rural villages. Although the article correctly mentions that the energy efficiency of LED technology continues to improve, I found the efficiency comparison with fluorescent lights misleading, for two reasons. First, some manufacturers show their specs as lumens per watt of light output, while others show lumens per watt used by the LED. The former does not include power wasted as heat. Second, some comparisons are made using LED light that is concentrated in a narrow beam while the fluorescent lights are tested without fixtures.
Skip Nav Destination
Article navigation
August 01 2008
LED efficiencies: Apples and oranges
Bill Moran
Bill Moran
Search for other works by this author on:
Physics Today 61 (8), 15 (2008);
Citation
Bill Moran; LED efficiencies: Apples and oranges. Physics Today 1 August 2008; 61 (8): 15. https://doi.org/10.1063/1.2970953
Download citation file: