[ Spotlight: LED lighting ] Philips L Prize LED bulb
based on a number of variables, including the quality of components, and these can vary significantly. It is always advisable to consult lumen output or lux levels to have a more accurate means of comparison. Furthermore, lumens produced per watt can provide a good idea of the efficiency of the product.’
Organic produce
Although LED lighting is not yet mainstream, the next generation of this technology is beginning to create interest.
Organic LED (OLED) lighting works by passing electricity through one or more extremely thin layers of organic semiconductor material. Already being used in TVs and phones, OLED lighting products currently available include Philips Lighting’s Lumiblade panels and Osram’s Orbeos products. Duncan Chamberlain at Philips, states: ‘Designers, architects and consumers are increasingly using OLEDs in a variety of contexts – ceilings glowing with colour, glass walls that light up at the wave of your hand, or windows that provide subtle illumination after dark. The result is large areas of evenly distributed light that can be adjusted in brightness and colour and can be applied to almost any surface in almost any shape.’
Opportunity knocks There are clear opportunities for electrical contractors to take advantage of the rapid adoption of LED lighting, and by doing so they can use it as a way to enhance
Facts of the matter
n Lighting consumes 19 per cent of all electricity in the world. n The first LED device was crafted in 1907 by Captain H J Round, a British radio technology pioneer and a personal assistant to Guglielmo Marconi. n Nick Holonyak Jr is considered ‘the father of the modern LED’. In 1962, while working at General Electric, he developed the first practically functional visible spectrum LED device for commercial use. n In 2009, a typical 13W LED lamp emitted
450-650 lumens, which is equivalent to a standard 40W incandescent bulb. LEDs have become more efficient, so that now a 6W LED can easily achieve the same results. n LEDs produce a long service life of between 50,000-100,000 hours. This compares to 2,000-5,000 hours for an halogen bulb and 8,000-15,000 hours for a CFL. n Unlike CFLs LEDs don’t contain mercury and can be more safely disposed of. n A single kilowatt-hour (kWh) of electricity will generate 610g of CO2 emissions. Assuming the
average light bulb is on for 10 hours a day, a single 40W traditional bulb will generate 89kg of CO2
every year. A 10W LED equivalent will only be responsible for 28kg of CO2
over the same
period. n LEDs emit no ultraviolet radiation (UV) or infrared (IR), which makes them perfect to illuminate costly objects such as photographs, collections, paintings and so on. n They produce more light than heat, which makes them the safest form of lighting and reduces the risk of fires.
Manchester University’s switch to LED lilghting has reduced energy consumption
Manchester University switches on to LED lighting
Manchester University is the largest single site university in the UK, with 300 buildings over 299 acres and 50 miles of corridors, not to mention a student population of more than 35,000. Faced with a five per cent year-on-year carbon reduction target, energy engineer Damian Oatway analysed the university’s energy consumption and estimated that 55 per cent of that energy was consumed by lighting. With lighting representing an average of 21 per cent of a building’s total energy consumption, and with the continuing drive to reduce energy consumption in all types of buildings and facilities, LED lighting can make a substantial contribution towards energy reduction targets. Along with the environmental benefits, a positive financial impact can also be realised through the dramatic savings on energy bills. For Manchester University, installing Honeywell LED Lighting Battens in place of the existing T12 fluorescent luminaires resulted in a load reduction of 70 per cent and saved the university the equivalent of 8.6 tonnes of carbon over the course of the year.
Oatway commented: ‘We can see these results with a test installation in corridors in just one building.’
their own sustainability based credentials. Like other carbon reduction technologies such as renewable energy sources, LED lighting is on the radar of everybody from multinational corporations down to homeowners, as a key method of saving energy and money over the long- term.
July 2012 ECA Today 59
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