The white-tiled dining room has tractor-seat stools in front of the open kitchen and communal tables beneath industrial-looking lamps, plus a few two- and four-tops inside and out.

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So real that they even preform tests under two different light conditions because everyones household lamps are a bit different and that can make a big difference on how the colors appear.

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In Powys, the council decided to switch off two-thirds of its 14, 000 lamps.

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The key feature of Tivoli is its manicured gardens, which are illuminated at night by more than 120, 000 lamps, swelling to more than two million lights during the winter Christmas markets.

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The two-and-a-half-year pilot, called LightSavers, tested 533 LED lamps in 15 trials in 12 cities, including New York, London, Hong Kong, Toronto, and Sydney.

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