By Rob Van Heur / Published on Tue, 2007-07-10 00:00
The amount of energy consumed by lighting systems is significant, estimated, in 2005, at 2600 TWh (terawatt-hours) or 19% of total global electricity consumption. Over the last decade it is estimated that global demand for artificial light grew at an average rate of 2.4% a year. In terms of lumens, not electricity consumed, about 12 % lighting is used for outdoor lighting, 15% for residential lighting and the remainder for commerce and industry.
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