In Bangkok buildings, lighting savings lead to significant percentage savings in cooling and ventilation systems (left), which contribute to up to a third of total combined lighting HVAC savings (right). Effects vary considerably, depending on the type of building. Combined savings equal 25-48% of total building energy use, with less than a three-year payback time. Source: J. Busch, et al., Energy-The International Journal, No.2. 1993 (Pergamon Press)
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