Lighting Power Density (LPD) measures the total electrical power consumed by fixed lighting installations per unit area, expressed in W/m² (or W/ft² in other regions). It includes all lighting components—fixtures, lamps, and control gear—operating at full power.

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LPD is essential for:

• ​Evaluating the energy performance of lighting systems.

• Comparing designs under energy code limits.

• Setting a maximum allowable lighting load per area defined by building type.

 

Here are the key triggers and timelines when a project must comply with the EMSD BEEO BEC (Building Energy Code) requirements in Hong Kong: -

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• New Building Projects

• Existing Buildings – Major Retrofitting

• Energy Audits for Commercial Buildings

• Effective Dates of BEC Editions