luminance
[ loo-muh-nuh ns ]
/ ˈlu mə nəns /
noun
the state or quality of being luminous.
Also called luminosity.
the quality or condition of radiating or reflecting light: the blinding luminance of the sun.
Optics.
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.
Origin of luminance
Words nearby luminance
lumen,
lumen-hour,
lumholtz's kangaroo,
luminaire,
luminal,
luminance,
luminaria,
luminary,
lumine,
luminesce,
luminescence
Example sentences from the Web for luminance
The remainder of the big room receded into a grey twilight encircling the patch of luminance.
The Lamp of Fate |Margaret PedlerA luminance seemed to come from above, from the unseen heights of the magnificent double staircase.
Helen with the High Hand (2nd ed.) |Arnold BennettA few fluoros cast wan puddles of luminance on the plastic flooring.
The Sensitive Man |Poul William Anderson
British Dictionary definitions for luminance
luminance
/ (ˈluːmɪnəns) /
noun
a state or quality of radiating or reflecting light
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
Word Origin for luminance
C19: from Latin
lūmen light
Scientific definitions for luminance
luminance
[ lōō′mə-nəns ]
The luminous intensity of a light source per unit area. Occasionally the lambert unit is used to measure luminance. Also called photometric brightness