What does illuminance mean?

Definitions for illuminance
ɪˈlu mə nənsil·lu·mi·nance

This dictionary definitions page includes all the possible meanings, example usage and translations of the word illuminance.

Princeton's WordNet

  1. illuminance, illuminationnoun

    the luminous flux incident on a unit area

Wiktionary

  1. illuminancenoun

    The luminous flux incident on unit area of a surface; measured in lux or lumens

Wikipedia

  1. Illuminance

    In photometry, illuminance is the total luminous flux incident on a surface, per unit area. It is a measure of how much the incident light illuminates the surface, wavelength-weighted by the luminosity function to correlate with human brightness perception. Similarly, luminous emittance is the luminous flux per unit area emitted from a surface. Luminous emittance is also known as luminous exitance.In SI units illuminance is measured in lux (lx), or equivalently in lumens per square metre (lm·m−2). Luminous exitance is measured in lm·m−2 only, not lux. In the CGS system, the unit of illuminance is the phot, which is equal to 10000 lux. The foot-candle is a non-metric unit of illuminance that is used in photography.Illuminance was formerly often called brightness, but this leads to confusion with other uses of the word, such as to mean luminance. "Brightness" should never be used for quantitative description, but only for nonquantitative references to physiological sensations and perceptions of light. The human eye is capable of seeing somewhat more than a 2 trillion-fold range. The presence of white objects is somewhat discernible under starlight, at 5×10−5 lux, while at the bright end, it is possible to read large text at 108 lux, or about 1000 times that of direct sunlight, although this can be very uncomfortable and cause long-lasting afterimages.

ChatGPT

  1. illuminance

    Illuminance is a measure of the amount of light falling on a surface. It is defined as the total luminous flux incident on a surface, per unit area. It is a standard metric in photometry and is used in lighting design. The unit of illuminance is the lux (lx), equivalent to one lumen per square meter.

Wikidata

  1. Illuminance

    In photometry, illuminance is the total luminous flux incident on a surface, per unit area. It is a measure of how much the incident light illuminates the surface, wavelength-weighted by the luminosity function to correlate with human brightness perception. Similarly, luminous emittance is the luminous flux per unit area emitted from a surface. Luminous emittance is also known as luminous exitance. In SI derived units these are measured in lux or lumens per square metre. In the CGS system, the unit of illuminance is the phot, which is equal to 10,000 lux. The foot-candle is a non-metric unit of illuminance that is used in photography. Illuminance was formerly often called brightness, but this leads to confusion with other uses of the word. "Brightness" should never be used for quantitative description, but only for nonquantitative references to physiological sensations and perceptions of light. The human eye is capable of seeing somewhat more than a 2 trillion-fold range: The presence of white objects is somewhat discernible under starlight, at 5×10^−5 lux, while at the bright end, it is possible to read large text at 108 lux, or about 1,000 times that of direct sunlight, although this can be very uncomfortable and cause long-lasting afterimages.

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Numerology

  1. Chaldean Numerology

    The numerical value of illuminance in Chaldean Numerology is: 1

  2. Pythagorean Numerology

    The numerical value of illuminance in Pythagorean Numerology is: 5

Examples of illuminance in a Sentence

  1. Dr. Urooj Umer:

    Live like a star, that always and mesmerize others by its beauty but doesn't anyone by its illuminance and becomes a meteoroid itself...

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illuminance#100000#113550#333333

Translations for illuminance

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"illuminance." Definitions.net. STANDS4 LLC, 2024. Web. 22 Jun 2024. <https://www.definitions.net/definition/illuminance>.

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