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What does luminance mean?

Looking for the meaning or definition of the word luminance? Here's what it means.

Noun
  1. the quality of being luminous
  2. the amount of light that passes through, is emitted, or is reflected from a particular area, and falls within a given solid angle
  3. the luminous flux emitted in a given direction divided by the product of the projected area of the source element perpendicular to the direction and the solid angle containing that direction, i.e. luminous intensity divided by unit area; measured in stilbs or apostilbs
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Examples
Accurate measurement can be performed at luminance and chromaticity around calibration light source.
Transition Zone: Distance over which the luminance is reduced from the value at the end of the entrance zone to that inside the tunnel.
These effects of mean luminance are more complex than those seen for homochromatic flicker.
First, the.5 log unit ND reduction of luminance may have been excessive for a photopic task.
Ordinary outdoor scenes in daylight have an average luminance of several hundred candles per square foot.
As a result, the stability of the luminance and the chromaticity can be preserved against age deterioration.

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