Light bulbs
News from The Economist:

FOR an object whose image represents a bright idea the incandescent light bulb is increasingly being recognised as a bad one. After a century as a primary source of artificial light these energy-guzzling bulbs are set to be replaced by light-emitting diodes (LEDs), powered by semiconductors. And the switch will happen fast for a part of the electrical industry that has relied on a single technology for 100 years.

LEDs are already widely used as the backlights for mobile phones, computer monitors and televisions. A recent report by McKinsey, a consultancy, reckons that by 2020 LEDs could make up 59% by value of the total lighting market compared with 10% in 2010 (see chart). Revenues from lighting will hit €110 billion ($ 160 billion), roughly what the world will spend on televisions. Three-quarters of that will go on “general lighting” for homes, the biggest part of the market, and on work and outdoor illumination such as streetlamps.

The change is being driven by regul…………… continues on The Economist
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