candelan.
/kanˈdiːlə/, /kanˈdɛlə/, /ˈkandələ/, U.S. /kænˈdɛlə/, /kænˈdilə/ A unit of luminous intensity (see quot. 1968).
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the world > matter > light > illumination > [noun] > unit of illumination > candela
new candle1938
candela1950
cd1950
the world > matter > physics > electromagnetic radiation > light > intensity of light, luminosity > [noun] > unit of light intensity
lux1889
lumen1898
L1915
Lambert1915
phot1917
new candle1938
candela1950
cd1950
rayleigh1956
1950 Commission Internat. de l'Éclairage, 1948 14 It is recommended that the new unit for luminous intensity (which is such that the luminance or photometric brightness of a black body at the temperature of freezing platinum equals 60 units of intensity per square centimetre) shall be called in all countries by the Latin name ‘candela’, with the symbol ‘cd’.
1957 R. W. G. Hunt Reprod. Colour viii. 89 A purely physical or photometric quantity, measured, for instance,..in candelas or lumens per square foot if light units are used.
1960 Aerodrome Lighting (B.S.I.) 13 It may be said that in clear conditions the intensity of the runway lights should not exceed about 50 candelas.
1968 Nature 16 Nov. 651/2 The candela is the luminous intensity, in the perpendicular direction, of a surface of 1/600 000 square metre of a black body at the temperature of freezing platinum under a pressure of 101 325 newtons per square metre.
This entry has not yet been fully updated (first published 1972; most recently modified version published online March 2018).
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n.1950