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释义
the world > matter > physics > electromagnetic radiation > light > intensity of light, luminosity > [noun] > unit of light intensity (15)
lux1889

A unit of illumination (now incorporated into the International System of Units) equal to the illumination of a surface all of which is one metre…

lumen1898

A unit of luminous flux (now incorporated into the International System of Units), equal to the flux emitted by a point source of intensity one…

L1915

lambert.

Lambert1915

(Written lambert.) A unit of luminance equal to one lumen per square centimetre (equivalent to approximately 3180 candelas per square metre).

phot1917

A unit of illumination equal to 10,000 lux (one lumen per square centimetre).

new candle1938

A standard spermaceti candle formerly used as a unit of illuminating power: hence candle power; frequently called international candle. Also, with…

candela1950

A unit of luminous intensity (see quot. 1968).

cd1950

candela.

rayleigh1956

A unit of luminous intensity or brightness used esp. for aurorae and planetary objects, equal to one million photons per square centimetre of a…

Subcategories:

— specific measurements (3)
— superseded terms (3)
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