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The unseen areas of many large retailers are totally without natural light. At Ikea in Bilbao, Spain, the Parans system has been installed to transport light deep into the building.

Research (Romm and Browning, 1994) suggests a 15 per cent increase in staff performance when adding natural light to a workplace. The Journal of Property Management reported in January 2000 that a 1 per cent increase in productivity is equal to a typical company's total annual energy cost.

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