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单词 θ76472
释义
the world > matter > physics > electromagnetic radiation > light > intensity of light, luminosity > [noun] > unit of light intensity > superseded terms (3)
standard candle1850

(a) a former unit of luminous intensity, defined as the intensity of the flame of a spermaceti candle of specified properties (see quot. 1937)…

phot1894

A unit of the product of illumination and duration, equivalent to one lux maintained for one second. Obsolete.

photon1916

Optics. A unit of retinal illumination: = troland, n. Now rare.

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