ความส่องสว่าง

thumb|A tea light-type candle, imaged with a luminance camera; [[false colors indicate luminance levels per the bar on the right (cd/m2)]] Luminance is a photometric measure of the luminous intensity per unit area of light travelling in a given direction. It describes the amount of light that passes through, is emitted from, or is reflected from a particular area, and falls within a given solid angle.