- the state or quality of being luminous.
- the quality or condition of radiating or reflecting light: the blinding luminance of the sun.
- 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.
- 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
