What is Part L?

Part L of the Building Regulations governs the conservation of fuel and power in buildings.

Energy efficiency requirements for lighting are set out in the Building Services Compliance Guides where two methods of demonstrating compliance are detailed. Minimum efficacy standards for light fittings are defined as one approach, alternatively compliance can be indicated through the use of the Lighting Energy Numerical Indicator (LENI) method.

For further information or any assistance on Part L compliance please contact our Lighting Design department.

Thorlux has developed a PDF containing a comprehensive table providing the information required to calculate luminaire efficacy.

For lamp efficacy please see the lamps and transformers section. For further information or any assistance on calculating lighting efficacy please contact our Lighting Design department