VS.

Candela vs. Lumen

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Candelanoun

In the International System of Units, the base unit of luminous intensity; the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 × 1012 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian. Symbol: cd

Lumennoun

(physics) In the International System of Units, the derived unit of luminous flux; the light that is emitted in a solid angle of one steradian from a source of one candela. Symbol: lm.

Candelanoun

the basic unit of luminous intensity adopted under the System International d'Unites.

Lumennoun

(anatomy) The cavity or channel within a tube or tubular organ.

Candelanoun

the basic unit of luminous intensity adopted under the Systeme International d'Unites; equal to 1/60 of the luminous intensity per square centimeter of a black body radiating at the temperature of 2,046 degrees Kelvin

Lumennoun

(botany) The cavity bounded by a plant cell wall.

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Candela

The candela ( or ; symbol: cd) is the base unit of luminous intensity in the International System of Units (SI); that is, luminous power per unit solid angle emitted by a point light source in a particular direction. Luminous intensity is analogous to radiant intensity, but instead of simply adding up the contributions of every wavelength of light in the source's spectrum, the contribution of each wavelength is weighted by the standard luminosity function (a model of the sensitivity of the human eye to different wavelengths).

Lumennoun

(medicine) The bore of a tube such as a hollow needle or catheter.

Lumennoun

A unit of illumination, being the amount of illumination of a unit area of spherical surface, due to a light of unit intensity placed at the center of the sphere.

Lumennoun

An opening, space, or cavity, esp. a tubular cavity; a vacuole.

Lumennoun

a unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a point source of 1 candela intensity radiating uniformly in all directions

Lumennoun

a cavity or passage in a tubular organ;

‘the lumen of the intestine’;

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Lumennoun

the SI unit of luminous flux, equal to the amount of light emitted per second in a unit solid angle of one steradian from a uniform source of one candela.

Lumennoun

the central cavity of a tubular or other hollow structure in an organism or cell

‘the stomach empties food into the lumen of the small intestine’;

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