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1. The condition or quality of being luminous.
2. Physics The intensity of light per unit area of its source. Also called photometric brightness.


1. a state or quality of radiating or reflecting light
2. (General Physics) a measure (in candelas per square metre) of the brightness of a point on a surface that is radiating or reflecting light. It is the luminous intensity in a given direction of a small element of surface area divided by the orthogonal projection of this area onto a plane at right angles to the direction. Symbol: L
[C19: from Latin lūmen light]


(ˈlu mə nəns)

1. the state or quality of being luminous.
2. the quality or condition of radiating or reflecting light: the blinding luminance of the sun.
3. the quantitative measure of brightness of a light source or an illuminated surface, equal to luminous flux per unit solid angle emitted per unit projected area of the source or surface.
[1875–80; < Latin lūmin- (see lumen) + -ance]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.luminance - the quality of being luminousluminance - the quality of being luminous; emitting or reflecting light; "its luminosity is measured relative to that of our sun"
physical property - any property used to characterize matter and energy and their interactions
illuminance, illumination - the luminous flux incident on a unit area
incandescence - light from heat
glow, luminescence - light from nonthermal sources
References in periodicals archive ?
a leader in digital imaging solutions, today announced the Canon DP-V2411 4K HDR1 Reference Display, a 24-inch display that features stable high luminance and 12G-SDI terminals, ideal for use on-set in broadcasting vans, and in-studio needs.
A study of more than 2,500 people provides new evidence about the effects of luminance on the quality and consistency of our financial decision-making.
Tacloban is one of the first local government units (LGUs) in the Philippines to have LED-retrofitted streetlights, according to local energy solutions firm Luminance Inc.
Comprised of the combined signal of all three color channels, a synthetic luminance is used to complement the color image, much in the way that a true luminance adds contrast and detail to an RGB image.
Dressing up her strapless black Ralph Lauren gown, Winslet wore the Luminance bracelet, matching Luminance earrings and a 2ct Pear Celestial ring, encrusted with almost a 100 carats diamonds in total.
The current design process requires us to use corrections for the lamp lumen depreciation, dirt depreciation and other factors to calculate the resulting maintained luminance.
Vivid colors along the spectrum of the RGB color space strongly differ in their luminance, which can lead to artificial dark or bright bands that can obscure the information shown.
The ISS-17-VA integrating sphere source calibration standard for spectral radiance and luminance offers a variable light-intensity output while maintaining a constant color temperature.
The amount of sign luminance provided by sign lighting and roadway lighting is easier to be measured as they mostly provide diffuse lights to the sign, but it is harder to quantify the reflected lights from adjacent vehicle headlamps to the sign.
Inter-trial effect in luminance processing revealed by magnetoencephalography *
Does normal aging specifically affect different brain areas involved in luminance information processing?
com)-- QUBYX has announced that its DICOM calibration solution PerfectLum now supports Konica Minolta CS200, a professional and highly accurate luminance and color meter.