cdv3rev 12026-03-17INTERNATIONAL BUREAU OF WEIGHTS AND MEASURES (BIPM); The International System of Units (SI) - 9th editon 2019
candela
0112/2///62720#UAA370
SI unit of Iuminous intensity in a given direction defined by taking the fixed numerical value of the luminous efficacy of monochromatic radiation of frequency 540 × 1012 Hz, Kcd, to be 683 when expressed in the unit lm W-1, which is equal to cd sr W-1, or cd sr kg-1 m-2 s3, where the kilogram, metre and second are defined in terms of h, c and ∆νCs
unitAll properties21#
- Version
- 3
- Revision
- 1
- Preferred name
- candela
- Short name
- cd
- Definition
- SI unit of Iuminous intensity in a given direction defined by taking the fixed numerical value of the luminous efficacy of monochromatic radiation of frequency 540 × 1012 Hz, Kcd, to be 683 when expressed in the unit lm W-1, which is equal to cd sr W-1, or cd sr kg-1 m-2 s3, where the kilogram, metre and second are defined in terms of h, c and ∆νCs
- Definition source
- INTERNATIONAL BUREAU OF WEIGHTS AND MEASURES (BIPM); The International System of Units (SI) - 9th editon 2019
- Note
- Base unit of the International System of Units (SI)
- Unit structure
- cd¹
- Unit in text
- candela
- Unit in SGML/XML
Structured markup (math)(122 chars)
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block"> <!-- UAA370 --> <mi mathvariant="normal">cd</mi> </math>
- UN/ECE code
- CDL
- Unit conversion
Structured markup (UnitsML)(503 chars)
<UnitsML xmlns="https://schema.unitsml.org/unitsml/1.0"><Unit xml:id="0112/2///62720#UAA370"><Conversions><Float64ConversionFrom xml:id="UAA370_from_UAA370" initialUnit="0112/2///62720#UAA370" multiplicand="1" divisor="1" exact="true" /></Conversions></Unit><Unit xml:id="https://si-digital-framework.org/SI/units/candela"><Conversions><Float64ConversionFrom xml:id="SI::candela_from_UAA370" initialUnit="0112/2///62720#UAA370" multiplicand="1" divisor="1" exact="true" /></Conversions></Unit></UnitsML>
- Responsible committee
- IEC/SC 3D
- Publisher
- IEC
- Published in
- IEC 62720
- Status level
- Standard
- Version release date
- 2026-03-17
- Revision release date
- 2026-03-17
- Version initiation date
- 2026-03-17
- Change request ID
- C00192