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illuminance
il·lu·mi·nance I0038000 (ĭ-lo͞o′mə-nəns)n. See illumination.illuminance (ɪˈluːmɪnəns) n (General Physics) the luminous flux incident on unit area of a surface. It is measured in lux. Symbol: Ev Sometimes called: illumination Compare irradianceil•lu•mi•na•tion (ɪˌlu məˈneɪ ʃən)
n. 1. an act or instance of illuminating. 2. the state of being illuminated. 3. a decoration of lights. 4. Sometimes, illuminations. a display using lights as a major decoration. 5. intellectual or spiritual enlightenment. 6. the intensity of light falling at a given place on a lighted surface; the luminous flux incident per unit area, expressed in lumens per unit of area. 7. a supply of light. 8. decoration of a manuscript or book with a painted design in color and gold or silver. 9. a design used in such decoration. [1300–50; Middle English < Latin] Thesaurus| Noun | 1. | illuminance - the luminous flux incident on a unit areailluminationbrightness level, luminance, luminosity, luminousness, brightness, light - the quality of being luminous; emitting or reflecting light; "its luminosity is measured relative to that of our sun" |
Translationsilluminance
illuminance: see photometryphotometry
, branch of physics dealing with the measurement of the intensity of a source of light, such as an electric lamp, and with the intensity of light such a source may cast on a surface area.
..... Click the link for more information. .Illuminance A term expressing the density of luminous flux incident on a surface. This word has been proposed by the Colorimetry Committee of the Optical Society of America to replace the term illumination. The definitions are the same. The symbol of illumination is E, and the equation is E = dF/dA, where A is the area of the illuminated surface and F is the luminous flux. See Luminous flux, Photometry IlluminanceCommonly called light level, illuminance refers to the light intensity arriving on a surface, measured in foot-candles (fc). It is the standard international unit that is used to measure the amount of light per unit of surface area, also known as lux (lx). Measurements of illuminance are used to select lighting fixtures and to evaluate a lighting design. The photometric data to be considered include the luminous-intensity distribution curve (LIDC), the coefficient of utilization (CU), and the light loss factor (LLF).Illuminance (at a point of a surface), a unit of light, equal to the ratio of the luminous flux incident upon a small surface element ΔS containing the point being considered to the area of ΔS. Stated differently, illuminance is the surface density of the luminous flux. If the dimensions of the source of light are small in comparison with the distance l of the source from ΔS, then the illuminance E = I cos α/l2, where I is the luminous intensity of the source and α is the angle of incidence of the light upon ΔS, that is, the angle between the direction of the luminous flux and a line perpendicular to ΔS. Units of illuminance are the lux and the phot: 1 phot = 104 lux. illuminance[ə′lü·mə·nəns] (optics) The density of the luminous flux on a surface. Also known as illumination; luminous flux density. illuminanceThe density of luminous power, also called illumination. One lumen of luminous flux, uniformly incident on 1 square foot of area, produces an illuminance of 1 footcandle; in SI units, one lumen of luminous flux, uniformly incident on 1 square meter of area, produces an illuminance of 1 lux.illuminance
illuminanceQuotient of the luminous flux, F, incident on an element of surface divided by the area, A, of that element of surface. Symbol: E. ThusE = F/AThe units are in lux or footcandles. Syn. illumination. See inverse square law of illumination; photometer.illuminance
Synonyms for illuminancenoun the luminous flux incident on a unit areaSynonymsRelated Words- brightness level
- luminance
- luminosity
- luminousness
- brightness
- light
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