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The Luminaire Efficiency Factor (LEF) for our luminaires as indicated by Part L2 of the Building Regulations can be simply calculated.
To assist in LEF calculations the following lamp data are provided as a guide to the Total Circuit Power (W) for single lamps within a circuit. The tables provide figures for both copper/iron (Cu/fe) and high frequency electronic ballasts (HF) Cu/fe information is shown within brackets.
The LOR (Light Output Ratio) is indicated under each polar diagram on the product or datasheet pages. For certain ambient and linear products where you may have both direct (DLOR) and indirect light (ULOR), the LOR used in the equation must be the sum of both. In the case of multiple lamps within a luminaire, simply multiply the circuit watts by the number of lamps employed.
Part L2 calls for luminaires to aim to achieve an LEF of >45 lumens per circuit watt. This can be determined by using a simple calculation as follows:
It is important to recognise that not all luminaires in a scheme have to be compliant. It is the overall efficiency of an installation that is judged. Certain luminaires, because of their nature are unlikely to achieve a rating of >45 lumens per circuit watt. Depending on the installation, these can be compensated for with other luminaires that exceed the minimum rating, and bring the overall efficiency of the scheme within the recommended parameters.
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