candela
Sign in to saveCandela (symbol: cd) is the SI unit of luminous intensity. It measures the luminous power per unit solid angle emitted in a particular direction. A common wax candle has a luminous intensity of roughly 1 cd.
AI overview
A candela (cd) is the standard scientific unit that measures how bright light appears in a particular direction. It matters because it gives us a precise, universal way to compare the brightness of different light sources—for example, a typical candle produces about 1 candela of light.
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Key facts
- Unit.caption
- Photopic (black) and scotopic (green) luminous efficiency functions. The photopic includes the CIE 1931 standard (solid), the Judd–Vos 1978 modified data (dashed), and the Sharpe, Stockman, Jagla & Jägle 2005 data (dotted). The horizontal axis is wavelength in nm.
- Unit.standard
- SI
- Unit.quantity
- luminous intensity
- Unit.symbol
- cd
- Unit.units1
- international candles
- Unit.inunits1
- ≈ cp
- Unit.units2
- Hefnerkerze
- Unit.inunits2
- ≈ HK
- Unit.name
- candela
- Unit.image
- 290px
via Wikipedia infobox
Article
9 sectionsContents
- Definition
- Explanation
- Examples
- History
- SI photometric light units
- Relationships between luminous intensity, luminous flux, and illuminance
- SI multiples
- Notes
- References
Candela (symbol: cd) is the SI unit of luminous intensity. It measures the luminous power per unit solid angle emitted in a particular direction. A common wax candle has a luminous intensity of roughly 1 cd.
The word candela is Latin for candle. The old name "candle" is still sometimes used, as in foot-candle and the modern definition of candlepower.