candela
E625463
The candela is the SI base unit of luminous intensity, used to quantify the perceived power of light emitted by a source in a given direction.
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
SI base unit
ⓘ
coherent SI unit ⓘ unit of luminous intensity ⓘ |
| baseQuantity | luminous intensity ⓘ |
| baseUnitIn | SI photometric units ⓘ |
| baseUnitNumber | 7 ⓘ |
| belongsToSystem |
International System of Units
NERFINISHED
ⓘ
SI ⓘ |
| definedByBody |
BIPM
NERFINISHED
ⓘ
CGPM NERFINISHED ⓘ |
| definedUsing |
luminous efficacy of monochromatic radiation of frequency 540×10^12 hertz
ⓘ
radiant intensity ⓘ steradian ⓘ watt per steradian ⓘ |
| definedUsingConstant | K_cd ⓘ |
| definitionEpoch | 2018 SI redefinition ⓘ |
| dependsOnHumanVisionModel | photopic luminous efficiency function V(λ) ⓘ |
| dimensionSymbol | J ⓘ |
| hasPhysicalInterpretation | perceived power of light emitted in a given direction ⓘ |
| hasUnitClass | photometric unit ⓘ |
| isBaseForDerivedUnit |
candela per square metre
ⓘ
illuminance ⓘ lumen ⓘ luminance ⓘ luminous flux ⓘ lux ⓘ |
| isBaseUnitFor | photometry ⓘ |
| isDirectionalQuantity | true ⓘ |
| isNotRadiometric | true ⓘ |
| isOneOfSevenBaseUnits | true ⓘ |
| isPerceivedQuantity | true ⓘ |
| isScalarQuantity | true ⓘ |
| previousDefinitionEpoch | 1979 CGPM definition ⓘ |
| quantityMeasured | luminous intensity ⓘ |
| relatedUnit |
candela per square metre
ⓘ
lumen ⓘ lux ⓘ nit ⓘ |
| replacedUnit | candle (pre-SI unit) NERFINISHED ⓘ |
| symbol | cd ⓘ |
| usedInField |
display technology
ⓘ
illumination design ⓘ lighting engineering ⓘ optics ⓘ photometry ⓘ vision science ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
ampere