Candela

  • candela
    luminosity.svg
    photopic (black) and scotopic[1] (green) luminosity functions. the photopic includes the cie 1931 standard[2] (solid), the judd–vos 1978 modified data[3] (dashed), and the sharpe, stockman, jagla & jägle 2005 data[4] (dotted). the horizontal axis is wavelength in nm.
    general information
    unit systemsi base unit
    unit ofluminous intensity
    symbolcd 
    conversions
    1 cd in ...... is equal to ...
       international candles   ≈ 1.02 cp
       hefner kerze   ≈ 1.11 hk

    the candela (ə/ or ə/; 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).[4][5] a common wax candle emits light with a luminous intensity of roughly one candela. if emission in some directions is blocked by an opaque barrier, the emission would still be approximately one candela in the directions that are not obscured.

    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.[6]

  • definition
  • explanation
  • history
  • si photometric light units
  • see also
  • references

Candela
Luminosity.svg
Photopic (black) and scotopic[1] (green) luminosity functions. The photopic includes the CIE 1931 standard[2] (solid), the Judd–Vos 1978 modified data[3] (dashed), and the Sharpe, Stockman, Jagla & Jägle 2005 data[4] (dotted). The horizontal axis is wavelength in nm.
General information
Unit systemSI base unit
Unit ofLuminous intensity
Symbolcd 
Conversions
1 cd in ...... is equal to ...
   international candles   ≈ 1.02 cp
   Hefner Kerze   ≈ 1.11 HK

The candela (ə/ or ə/; 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).[4][5] A common wax candle emits light with a luminous intensity of roughly one candela. If emission in some directions is blocked by an opaque barrier, the emission would still be approximately one candela in the directions that are not obscured.

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.[6]

Other Languages
العربية: قنديلة
asturianu: Candela
Bân-lâm-gú: Candela
беларуская: Кандэла
беларуская (тарашкевіца)‎: Кандэла
български: Кандела
བོད་ཡིག: ཁེན།
bosanski: Kandela
brezhoneg: Candela
català: Candela
čeština: Kandela
Cymraeg: Candela
dansk: Candela
Deutsch: Candela
eesti: Kandela
Ελληνικά: Κηρίο (φυσική)
español: Candela
فارسی: شمع (یکا)
français: Candela
Gaeilge: Caindéile
galego: Candela
한국어: 칸델라
հայերեն: Կանդելա
हिन्दी: कैंडिला
hrvatski: Kandela
Bahasa Indonesia: Kandela
íslenska: Kandela
עברית: קנדלה
қазақша: Кандела
latviešu: Kandela
Lëtzebuergesch: Candela
lietuvių: Kandela
magyar: Kandela
македонски: Кандела
Bahasa Melayu: Kandela
монгол: Кандел
Nederlands: Candela (eenheid)
日本語: カンデラ
Nordfriisk: Candela
norsk: Candela
norsk nynorsk: Candela
occitan: Candela
oʻzbekcha/ўзбекча: Kandela
ਪੰਜਾਬੀ: ਕੈਂਡੇਲਾ
Piemontèis: Candèila
Plattdüütsch: Candela (Eenheit)
polski: Kandela
português: Candela
русский: Кандела
Scots: Candela
Simple English: Candela
slovenčina: Kandela
slovenščina: Kandela
српски / srpski: Кандела
srpskohrvatski / српскохрватски: Kandela
suomi: Kandela
svenska: Candela
தமிழ்: கேண்டெலா
тоҷикӣ: Кандела
Türkçe: Kandela
українська: Кандела
اردو: کینڈیلا
Tiếng Việt: Candela
Winaray: Candela
粵語: 坎德拉
中文: 坎德拉