Luminance
Luminance (pronounced: loo-mi-nance) is a photometric measure of the luminous intensity per unit area of light travelling in a given direction. It describes the amount of light that passes through, is emitted or reflected from a particular area, and falls within a given solid angle.
Etymology
The term "luminance" is derived from the Latin word "lumen", which means "light".
Definition
Luminance is often used to characterize emission or reflection from flat, diffused surfaces. The measure of luminance is the candela per square metre (cd/m²). It is also used in the video and photography industries to quantify the level of brightness of a display or image respectively.
Related Terms
- Luminous intensity: This is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle.
- Candela: This is the SI unit of luminous intensity, one of the seven SI base units.
- Lux: This is the SI unit of illuminance and luminous emittance, measuring luminous flux per unit area.
- Luminous flux: This is the measure of the perceived power of light.
- Luminous energy: This is the energy of electromagnetic radiation of visible light.
- Luminosity: In astronomy, luminosity is the total amount of energy emitted per unit of time by a star, galaxy, or other astronomical object.
See Also
External links
- Medical encyclopedia article on Luminance
- Wikipedia's article - Luminance
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