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Energy Efficiency
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xxxxxx | Energy efficiency is said to be "the cheapest form of energy we can get" and a great opportunity towards sustainability and environmental protection. Efficient and clean technology is many times available and needs to be leveraged. The objective of this project is to allow easy access to knowledge and to facilitate the development of new initiatives developing, delivering or promoting energy efficient technology. |
Lighting
Submitted by Hans De Keulenaer on Tue, 2007-07-10 00:00.
By Rob Van Heur, Laborelec
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.
In commerce lighting accounts for around 40% of electricity consumption while in industry it is about 10%. It is estimated that about 35% of this electricity could be saved by re-lighting or efficient use of lighting. Savings are possible in every sector - the average lighting system had an efficacy of about 18 lumens per watt (lm/W) in the early sixties, by 2005 it reached 50 lm/W.
This application note discusses the requirements for lighting in commercial buildings and the characteristics and the efficiencies of available light sources.
