definition
strict definition
lighting power density
The electrical power used to illuminate a space, expressed in watts per unit of area.
Lighting power density is the amount of electrical power used to illuminate a space, expressed in watts per unit of area. Its value results both from the lighting needs of a particular space as well as the efficiency of the lighting devices used in it.
The numerator is the power used for lighting and the denominator is the area being lit. The resulting density allows the lighting demand of differently sized spaces to be expressed on an area basis.
The value does not include a duration. Hours of lighting use affect the energy consumed, even when lighting power density remains unchanged.
Related definitions
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annual electricity consumption
The total number of kilowatt-hours consumed by a structure or other object within a year. -
annual electricity production
The total number of kilowatt-hours produced within a structure or other object within a year. -
annual energy consumption rate
The annual energy usage in kilowatt-hours per square unit of gross floor space. -
peak electric demand
The highest simultaneous electrical power demand actually recorded within an object or space. -
plug load power density
The electrical power used by plugged-in equipment, expressed in watts per unit of floor area. -
power consumption
The number of kilowatts (kW) normally used by an object when fully operating. -
power output
The number of kilowatts (kW) normally generated by an object when fully operating.