2026-2030 Floor Level 10 Practice Test

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Which description best distinguishes lighting power density (LPD) from illuminance?

LPD is energy used per area for lighting; illuminance is the light level on surfaces.

LPD is the light level on surfaces; illuminance is energy used per area.

LPD is energy used per area for lighting; illuminance measures light level on surfaces (lux/foot-candle).

LPD evaluates how much electrical power is spent to light a space, per unit area, typically in watts per square meter or square foot. Illuminance describes the amount of light that actually falls on or reaches surfaces, measured in lux or foot-candles. These are different quantities: one is about energy use, the other about light level at surfaces. Therefore, the best description is that LPD is energy used per area for lighting, while illuminance measures the light level on surfaces (lux/foot-candles).

LPD measures the current in lighting circuits; illuminance measures color temperature.

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