luminance


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lu·mi·nance

(lū'mi-nănts),
The brightness of an object, expressed as the luminous flux per unit solid angle per unit projected area, measured in lamberts or in candelas per square meter.
[L. lumino, to light up, fr. lumen, light]

luminance

the brightness of a light-emitting source (e.g., a view box or computer monitor).

lu·mi·nance

(lū'mi-năns)
The brightness of an object, expressed as the luminous flux per unit solid angle per unit projected area, measured in lamberts or in candelas per square meter.
[L. lumino, to light up, fr. lumen, light]

luminance

Photometric term characterizing the way in which a surface emits or reflects light in a given direction. It is equal to the luminous intensity measured in a given direction divided by the area of this surface projected on a perpendicular to the direction considered. Symbol: L. Units: candela per square metre (SI unit); footlambert; lambert, etc. See brightness; candela per square metre; footlambert; lambert; lightness; millilambert; nit; photometry; SI unit.
References in periodicals archive ?
4 and 5, the supply luminance (L) of a retroreflective sign from each headlamp, directed toward the driver, is estimated using Equation (2):
In the second part of the experiment, the magnitude estimation task, only four levels of luminance were presented for each color (the "off' condition was excluded).
Given the dynamic nature of daylight in day-lighting applications, however, it becomes important to acquire luminance data over time.
88% preferred the set with better wide-angle luminance in a direct comparison
Each group of sentences appeared in white text on black background (mean luminance contrast = 2.
Generally, the retroreflective properties of these materials tend to increase as the numerical type increases, but this is not the purpose of the designations (they simply represent different types of performance), and some materials with higher numeric types could have narrower angular distributions than others so that their luminance might be brighter in a 'head on' situation but lower in 'off-axis' situation.
Therefore, the major concern in the manufacturing of LGP is the light transmission, termed luminance, because it needs to deliver the light from its edges to the front surface with the highest possible efficiency.
The CS-2000 is a high-speed, high-accuracy instrument for measuring the luminance and chromaticity of various display devices such as plasma displays, LCDs, and LEDs.
A combination of high transmissivity of LTPS TFT LCD technology and NEC LCD Technologies' own unique super-reflective natural light TFT (SR-NLT) technology achieves high luminance of 200cd/m2 and a high reflective ratio of 15%, despite a super-high density of 229 ppi.
The company has revised the molecular structure of the material to achieve a luminance efficiency of 9cd/A, 30% higher than the company's existing material, and a brightness half-life of 23,000 hours (a threshold luminance of 1,000cd/m2), 130% longer, in emitting blue light which most affects the display's power consumption and life.
6m high door of solid wenge wood which, once opened, reveals a shaft of luminance falling from the tall translucent panel that rises vertically in the upper part of the entrance sequence.