Difference between revisions of "Light Emitting Diode (LED)"
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| − | "'''A light-emitting diode (LED)''' is a semiconductor light source. LEDs are used as indicator lamps in many devices and are increasingly used for other lighting. Introduced as a practical electronic component in 1962, early LEDs emitted low-intensity red light, but modern versions are available across the visible, ultraviolet and infrared wavelengths, with very high brightness."<ref name="Wikipedia.org: http://en.wikipedia.org/wiki/Light-emitting_diode">Wikipedia.org: http://en.wikipedia.org/wiki/Light-emitting_diode | + | "'''A light-emitting diode (LED)''' is a semiconductor light source. LEDs are used as indicator lamps in many devices and are increasingly used for other lighting. Introduced as a practical electronic component in 1962, early LEDs emitted low-intensity red light, but modern versions are available across the visible, ultraviolet and infrared wavelengths, with very high brightness."<ref name="Wikipedia.org: http://en.wikipedia.org/wiki/Light-emitting_diode">Wikipedia.org: [https://en.wikipedia.org/wiki/Light-emitting_diode http://en.wikipedia.org/wiki/Light-emitting_diode] |
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| − | </ref>< | + | Since the early 2000s, a mix of efficiency measures, quality of light color and increased efficiency of manufacturing practices, have caused a significant expansion of LED use. Philips released its first LED lamp bulb in 2009,<ref name="auto">{{Cite web|title=Philips Master LEDbulb 'Glow' 7W|url=http://www.lamptech.co.uk/Spec%20Sheets/LEDi%20Philips%20400A60IF827-E27%20Glow.htm|access-date=2025-04-11|website=www.lamptech.co.uk}}</ref> followed by the world's first 60 W equivalent LED lamp in 2010,<ref>{{Cite web|title=Philips LED 60W 806lm Retrofit with Remote Phosphor|url=http://www.lamptech.co.uk/Spec%20Sheets/LEDi%20Philips%20806K58RP827-B22d%20Prince.htm|access-date=2025-04-11|website=www.lamptech.co.uk}}</ref><ref>{{Cite magazine|date=2009-11-12|title=The 50 Best Inventions of 2009 - TIME|url=https://content.time.com/time/specials/packages/article/0,28804,1934027_1934003_1933947,00.html|access-date=2025-04-11|magazine=Time|language=en-US|issn=0040-781X}}</ref><ref>{{Cite web|title=Philips rolls out 12-watt EnduraLED: world's first 60-watt equivalent LED light bulb|url=https://www.zdnet.com/article/philips-rolls-out-12-watt-enduraled-worlds-first-60-watt-equivalent-led-light-bulb/|access-date=2025-04-11|website=ZDNET|language=en}}</ref> and a 75 watt equivalent version in 2011.<ref>{{Cite web|date=2011-05-16|title=Philips Announces the World's First LED Replacement for the 75-Watt Bulb|url=https://inhabitat.com/philips-to-unveil-the-worlds-first-led-replacement-for-the-75-watt-bulb/|access-date=2025-04-11|website=Inhabitat - Green Design, Innovation, Architecture, Green Building {{!}} Green design & innovation for a better world|language=en-US}}</ref> Since a number of other manufacturers have followed. For example, by 2019 electricity usage in the United States had decreased for at least five straight years, due in part to U.S. electricity consumers replacing incandescent light bulbs with LEDs due to their [[Efficient energy use|energy efficiency]] and high performance. <ref>{{cite news|last=Craven McGinty|first=Jo|title=Americans Are No Longer Gluttons for Electricity – Thank the LED Bulb: After increasing 10-fold between 1950 and 2010, average residential consumption dipped|newspaper=The Wall Street Journal|date=11 October 2019|url=https://www.wsj.com/articles/americans-are-no-longer-gluttons-for-electricitythank-the-led-bulb-11570791602|quote=For more than five years, Americans have been doing something decidedly un-American: We've been using less electricity. . . . [T]oday's electronics and appliances are more efficient. New homes are tighter and better insulated. And most important, light-emitting diodes, or LEDs, have replaced traditional incandescent light bulbs.}}</ref> |
| − | < | + | Modern LED bulbs use up to 90% less energy than incandescent bulbs and last about 25 times longer.<ref>WWF. ''Green tips''. https://www.worldwildlife.org/resources/tips/green-tips/ (accessed November 2026), via the [https://climateinsightsdirectory.org/document/wwf-000047 Climate Insights Directory].</ref> For energy projects in development contexts, low-cost, efficient LEDs made small solar products practical. LED lights in solar lanterns and [[Solar Home Systems (SHS)|solar home systems]] now replace kerosene lamps in many off-grid homes, which also cuts black carbon pollution.<ref>Vulturius, G. and Tuhkanen, H. (2020). ''Matchmaking power: expanding climate finance for off-grid solar electricity''. Stockholm Environment Institute. https://www.sei.org/wp-content/uploads/2020/04/sei-db-off-grid-solar-vulturius-2020.pdf , via the [https://climateinsightsdirectory.org/document/sei-002538 Climate Insights Directory].</ref> |
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| + | In developing countries, increased lighting in Urban environments can also significantly increase safety. One assessment of projects in the Carribbean, found that LED street lights can make public spaces safer for women and girls, and let small informal businesses stay open later in the evening.<ref>Green Climate Fund (2025). ''Scaling up the Deployment of Integrated Utility Services (IUS) to Support Energy Sector Transformation in the Caribbean (Phase 1): Gender assessment''. https://www.greenclimate.fund/sites/default/files/document/fp275-gender-assessment.pdf , via the [https://climateinsightsdirectory.org/document/gclifun-005296 Climate Insights Directory].</ref> | ||
Revision as of 19:06, 6 November 2026
Overview
"A light-emitting diode (LED) is a semiconductor light source. LEDs are used as indicator lamps in many devices and are increasingly used for other lighting. Introduced as a practical electronic component in 1962, early LEDs emitted low-intensity red light, but modern versions are available across the visible, ultraviolet and infrared wavelengths, with very high brightness."[1]
Since the early 2000s, a mix of efficiency measures, quality of light color and increased efficiency of manufacturing practices, have caused a significant expansion of LED use. Philips released its first LED lamp bulb in 2009,[2] followed by the world's first 60 W equivalent LED lamp in 2010,[3][4][5] and a 75 watt equivalent version in 2011.[6] Since a number of other manufacturers have followed. For example, by 2019 electricity usage in the United States had decreased for at least five straight years, due in part to U.S. electricity consumers replacing incandescent light bulbs with LEDs due to their energy efficiency and high performance. [7]
Modern LED bulbs use up to 90% less energy than incandescent bulbs and last about 25 times longer.[8] For energy projects in development contexts, low-cost, efficient LEDs made small solar products practical. LED lights in solar lanterns and solar home systems now replace kerosene lamps in many off-grid homes, which also cuts black carbon pollution.[9]
In developing countries, increased lighting in Urban environments can also significantly increase safety. One assessment of projects in the Carribbean, found that LED street lights can make public spaces safer for women and girls, and let small informal businesses stay open later in the evening.[10]
Further Information
References
- ↑ Wikipedia.org: http://en.wikipedia.org/wiki/Light-emitting_diode
- ↑ Template:Cite web
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- ↑ Template:Cite magazine
- ↑ Template:Cite web
- ↑ Template:Cite web
- ↑ Template:Cite news
- ↑ WWF. Green tips. https://www.worldwildlife.org/resources/tips/green-tips/ (accessed November 2026), via the Climate Insights Directory.
- ↑ Vulturius, G. and Tuhkanen, H. (2020). Matchmaking power: expanding climate finance for off-grid solar electricity. Stockholm Environment Institute. https://www.sei.org/wp-content/uploads/2020/04/sei-db-off-grid-solar-vulturius-2020.pdf , via the Climate Insights Directory.
- ↑ Green Climate Fund (2025). Scaling up the Deployment of Integrated Utility Services (IUS) to Support Energy Sector Transformation in the Caribbean (Phase 1): Gender assessment. https://www.greenclimate.fund/sites/default/files/document/fp275-gender-assessment.pdf , via the Climate Insights Directory.
