The White Light Story Previous slide Next slide Back to first slide View graphic version
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Advances in LED Traffic Lights First LED traffic lights had 700 LEDs Next generation 200 LEDs Latest generation 20 LEDs Some LED traffic light in the UK: – London, Marsham Street – M32 near Bristol Previous slide Next slide Back to first slide View graphic version
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Denver Colorado, USA Red and Green Traffic Lights LEDS 13,000 150W bulbs 12W LED units Power bill $330,000 p.a. $26,000 p.a. Save $5m over 10 years after paying for itself Save annually: 17,000,000 lbs of CO2 25,000,000 gms of SO2 25,000,000 gms of Nox Equivalent to planting 2,000 acre...
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Traffic Lights Tomorrow LEDs made possible by designed materials Replace every 10 years, not six months Brighter than lamps – safer Good for train signals as well Fail safely at end of life – safer Save electricity costs Save about 1,000 per junction per year Reduced CO2 emissions from...
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Green LEDs First InGaN green LED in 1995 – efficiency 3 lumens/watt Today – efficiency 50 lumens/watt Green filtered incandescent lamp – efficiency 10 lumens/watt 5 times increase in efficiency for green LEDs 25 times increase for red LEDs Amber LEDs? About same efficiency as lamps Last 100,000 hours...
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LED Traffic Lights and the Largest Hotel Sign in the World Previous slide Next slide Back to first slide View graphic version
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Traffic Lights Today Long Life tungsten halogen light bulbs Replaced every six months Sometimes fail before this Previous slide Next slide Back to first slide View graphic version
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LEDs of all Colours Made possible by new designed material – gallium nitride (GaN) InxGa1-xN. Vary x. Get light of any colour. Another new material made to measure. InN GaN AlN Eg 1.9eV 3.4eV 6.2eV Light Red Blue UV Previous slide Next slide Back to first slide View graphic...
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The Sterling Group consists of research-led UK universities which share a commitment to international excellence in Engineering research and teaching. The current membership is 24 institutions. The Group was founded around ten years ago to demonstrate to countries in South East Asia, particularly Malaysia and Singapore, that the highest...
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Red LEDs for Rear Bicycle Light Efficiency of: Light bulbs = 17 Red light bulbs = 4 Red LEDs = 100 Batteries last 25 times as long LEDs last 100 times longer than bulbs Previous slide Next slide Back to first slide View graphic version
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