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Definitions (12)
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color rendering index
Color rendering is the ability of a light source to produce color in objects. The CRI is expressed on a scale from 0-100, where 100 is the best in producing vibrant color in objects. Relatively speaki [..]
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color temperature
A measure of the color of a light source relative to a black body at a particular temperature expressed in degrees Kelvin (°K). Incandescent lights have a low color temperature (approximately 2800°K) [..]
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efficacy
Efficacy is an industry term for the amount of light produced per watt of electricity (comparable to efficiency). It is the rate at which a light bulb is able to convert electrical power (watts) into [..]
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exitance
The term used to describe the total light which comes off a surface. Exitance is dependent upon the illuminance on and the reflectance of the surface.
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footcandle
The unit of measure for the density of light as it reaches a surface. One footcandle is equal to one lumen per square foot. Measured footcandles are sensitive to the distance from the source to the su [..]
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illuminance
The density of luminous flux on a surface, is measured in footcandles (one lumen per square foot) or lux (one lumen per square meter).
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illumination
The result of the use of light.
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light
The energy that allows us to see. Light can be expressed in terms of intensity (candela), flux (lumen), luminance (candela/square foot), and exitance (lumen/square foot).
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lighting power budget
Lighting power budget is the upper limit of power to be available to provide the lighting needs for a building, including all permanently connected lighting.
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lighting power density
Lighting power density is the maximum allowable lighting density permitted by the code. It is expressed in watts per square foot for a given occupancy/space type.
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