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British designed light bulb scoops international prize

16 March 2011 Last updated at 23:56 GMT

The winner of one of the world's most prestigious design competitions is a sculpted, low-energy light bulb created by a British designer and praised for bringing "a measure of delight to an everyday product".

The Plumen bulb uses 80 per cent less energy and lasts eight times longer than a traditional one.

Will Gompertz reports.