Energy efficient lighting

Whether you are an interior designer, architect, electrical contractor, lighting designer, mechanical and electrical engineer or anyone else responsible for the lighting design and specification for a project that is subject to the UK building regulations you need to ensure that it meets Part L of those regulations.  Since October 2010 75% of the interior lighting in a Part L compliant design needs to be “energy efficient”.  The definition of energy efficient means that these interior light fittings must have a luminous efficacy of at least 45 lumens per circuit watt and have a total output of at least 400 lumens per fitting.  Fittings of less than 5 circuit watts do not count in the calculations so must not be included.

For homes, full details are available in the Domestic Building Services Compliance Guide which can be found at:

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