In the evenings the city's wealthy roam the streets of Karada, in the center of the city, where the lights shine almost as bright as Times Square.

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Blue lights shine up through the glass and steel floor.

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Inside the greenhouse, lines of bright sodium lights shine down on the growing tomato plants, and the temperature remains a constant, warm 23C -- even in the depths of winter when outside temperatures drop well below freezing.

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Simply put, this means choosing lights that shine down, not up, and that emit light only in those parts of the spectrum that the human eye can perceive.

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The lights will shine nightly until Sunday 4 November.

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The whirligigs were made from recycled heating and air conditioning systems and reflector material Simpson patiently cut into thousands of tiny pieces that made the works shine when lights hit them in the dark.

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