Light-emitting diode - Wikipedia, the free encyclopedia
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A light-emitting diode ( LED ) (pronounced /ˌɛl.iːˈdiː/ , or just ), is an electronic light source. LEDs are used as indicator lamps in many kinds of electronics and increasingly for lightin...
en.wikipedia.org/wiki/Light-emitting_diode
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The most efficient line voltage lighting product that I am aware of is an LED "light bulb" by Philips, claimed to achieve 75 lumens per watt. It is claimed to produce 600 lumens from 8 watts. As of 5/9/2009 it was unveiled as a preproduction model.
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members.misty.com/don/lede.html
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Lightbulb efficiency is measured in terms of lumens per watt. Compare incandescent, halogen, mercury vapor, fluorescent, metal halide and high-pressure sodium bulbs. ... Just as an automobile's fuel efficiency is measured in miles per gallon, lightbulb efficiency is measured in terms of lumens per watt—the amount of...
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www.mge.com/home/appliances/lighting/comparison.htm
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Light Bulbs at a Glance ... 33 - 100 lumens per watt ... 30 - 60 lumens per watt (200 lumens per watt)
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www.megavolt.co.il/Tips_and_info/bulbs_at_glance.html
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Cree announces it has achieved industry-best reported R&D results of 186 lumens per watt for a white power LED. ... Cree’s tests confirmed that the LED produced 197 lumens of light output and achieved 186 lumens per watt efficacy at a correlated color temperature of 4577K. The tests were conducted under standard LED...
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www.i-micronews.com/lectureArticle.asp?id=3813
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The online ramblings of Housebuilder's Bible author Mark Brinkley. ... BTW, Part L defines energy efficient lighting as anything that equals or betters 40 lumens per watt. Click on the chart to make it open up larger in another window.
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markbrinkley.blogspot.com/2009/04/lumens-per-watt-usefu...
markbrinkley.blogspot.com/2009/04/lumens-per-watt-useful-graph.html
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To reinforce that, LUX is the measurement of actual light available at a given distance. A lux equals one lumen incident per square meter of illuminated surface area. They're measuring the same thing, ... LUX is an abbreviation for Lumens per square meter. Foot-candles equal the amount of Lumens per square feet of area.
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www.theledlight.com/lumens.html
www.theledlight.com/lumens.html
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Incandescent Vlt Watt Lumens/watt (initial) 120 100 17 Quartz-halogen 12 5 10 10 11 20 15 (35 w/reflector) 35 40 120 20 14 35 17 50 16 100 20 Fluorescent T-12 120 80 Fluorescent T-8 120 90 Fluorescent T-5 120 75 (70 for multiple u-tubes) Metal halide 120 any 85 Around here, power costs about $ ... Subject: Lumens per watt...
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www.actwin.com/fish/aquatic-plants/month.9811/msg00633....
www.actwin.com/fish/aquatic-plants/month.9811/msg00633.html
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In about 5 minutes, I came up with the following table from data in Grainger's 385 (1994) catalog: Ranked in order of efficiency (more lumens per watt): 6: 60 Watt Daylight (6500K) HO Flourescent T-12 (all FLs are 48") Initial Lumens: 3600 Lumens per watt: 60 5: 110W Cool White (4100K) VHO FL T-12 Initial Lumens:
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fins.actwin.com/aquatic-plants/month.9602/msg00475.html
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