candela Hear it!

candela Definition

can·dela (kan dē′lə, -del′ə)

noun

the basic unit of luminous intensity in the SI system, now defined as the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 x 10 hertz and that has a radiant intensity in that direction of watt per steradian: abbrev. cd

Etymology: L, candle: adj. via Sp

adjective

designating a style of cigar with a greenish wrapper

candela (cd) Telecom Definition

The basic SI unit of luminous intensity. The standard originally was based on the light emission of a candle flame, then as the glow from molten platinum, but then things got more complicated. In contemporary SI terms, the candela is the luminous intensity, in the perpendicular direction, of an area of 1 / 600,000 square meter of a blackbody radiator at the temperature of freezing platinum (2,045 Kelvin), under a pressure of 101,325 newtons per square meter. One candela emits 4 lumens of light flux. For more information, get a degree in electrical engineering or physics, just like the person who came up with this way too complicated, but delightfully precise, measurement. See also luminance and SI.

candela Usage Examples

Preposition: per

meter: Light intensity The greater the light intensity ( candela per square meter, cd/m² ) the brighter the picture.

Noun used with modifier

air: With this in mind Molton Brown has created a luxurious collection of seven specially blended air candelas.

Browse dictionary entries near candela

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