Lowering Lighting Power Density (LPD) leads to what outcome in energy modeling?

• A. Increased cooling load.
• B. No impact on energy.
• C. Reduced energy consumption.
• D. Higher ignition risk.

Answer: (C)

Lower Lighting Power Density means using less electrical power per unit area for lighting. In energy modeling, this directly reduces the electric energy attributed to lighting, so the total modeled energy use for the building drops as you lower LPD. Less lighting energy often also means less waste heat from lamps, which can reduce cooling demand in the HVAC system, amplifying the overall savings in many simulations. The primary outcome is a decrease in total energy consumption. The other options don’t fit: cooling load doesn’t increase because of lower lighting energy, there is a clear impact on energy use, and ignition risk isn’t related to LPD.