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Exclusive: LENI included in Part L

The new version of Part L of the Building Regulations will include the energy-efficient lighting measure LENI, Lux magazine can reveal.

Part L is the section of the regulations that deals with energy efficiency, and the current method of calculating lighting efficiency is based on specifying minimum levels of performance (in lumens per circuit watt) for light fittings.
However, sources close to the department responsible for the regulations, the Department of Communiities and Local Government, say that in the 2013 version of Part L, the Government is set to include the new method preferred by the lighting industry.
The metric – based on what’s called the lighting energy numeric indicator, or LENI, and based on a complex calculation of factors – will be an alternative to the current luminaire-efficacy approach. It takes a more holistic approach and is expressed in kWh/m2 per year, making it easier to set a minimum and compare buildings.
If LENI achieves widespread adoption, then in future editions of Part L it could become the sole method.
The DCLG is set to announce the change this month, a move that will be welcomed by the Lighting Industry Association and the Society of Light and Lighting, who campaigned for the change.

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