Quantitative Properties of Light: The Measurement of Light
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Last updated 4:08 PM on 3/3/25
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16 Terms
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Luminous Flux (Φ)
The total quantity of light emitted by a source, regardless of direction or distribution.
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Unit of Luminous Flux
Lumen (lm)
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Analogy for Luminous Flux
Similar to the flow of water in plumbing.
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Efficacy
The measure of efficiency in converting energy into light, expressed in lumens per watt (lm/W).
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Illuminance (E)
The density of luminous flux incident on a surface.
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Unit of Illuminance
Lux (lx) = lumens per square meter (lm/m²) or Footcandle = lumens per square foot (lm/ft²).
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Luminous Intensity (I)
The amount of luminous flux emitted in a particular direction.
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Unit of Luminous Intensity
Candela (cd).
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Luminance (L)
The perceived brightness of an illuminated or luminous surface.
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Unit of Luminance
Candelas per square meter (cd/m²).
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Luminous Exitance (M)
The density of luminous flux leaving (reflected or transmitted) from a surface.
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Unit of Luminous Exitance
Lumens per square meter (lm/m²).
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What is the SI unit of Illuminance?
Lux (lx)
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What does Luminous Intensity measure?
The ability of a source to emit light in a given direction.
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How is Luminance defined?
The intensity of light per unit area as perceived.
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What is the definition of Luminous Exitance?
The density of light reflected or transmitted from a surface.
