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  2. Candela - Wikipedia

    en.wikipedia.org/wiki/Candela

    The candela (symbol: cd) is the unit of luminous intensity in the International System of Units (SI). [ 5 ] [ 6 ] It measures luminous power per unit solid angle emitted by a light source in a particular direction.

  3. Luminous intensity - Wikipedia

    en.wikipedia.org/wiki/Luminous_intensity

    Symbol [nb 2] Name Symbol Luminous energy: Q v [nb 3] lumen second: lm⋅s T⋅J: The lumen second is sometimes called the talbot. Luminous flux, luminous power Φ v [nb 3] lumen (= candela steradian) lm (= cd⋅sr) J: Luminous energy per unit time Luminous intensity: I v: candela (= lumen per steradian) cd (= lm/sr) J: Luminous flux per unit ...

  4. SI base unit - Wikipedia

    en.wikipedia.org/wiki/SI_base_unit

    "The candela, symbol cd, is the SI unit of luminous intensity in a given direction. It is defined by taking the fixed numerical value of the luminous efficacy of monochromatic radiation of frequency 540 × 10 12 Hz , K cd , 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 s 3 , where the ...

  5. Category:Units of luminance - Wikipedia

    en.wikipedia.org/wiki/Category:Units_of_luminance

    Symbol [nb 2] Name Symbol Luminous energy: Q v [nb 3] lumen second: lm⋅s T⋅J: The lumen second is sometimes called the talbot. Luminous flux, luminous power Φ v [nb 3] lumen (= candela steradian) lm (= cd⋅sr) J: Luminous energy per unit time Luminous intensity: I v: candela (= lumen per steradian) cd (= lm/sr) J: Luminous flux per unit ...

  6. Luminance - Wikipedia

    en.wikipedia.org/wiki/Luminance

    Symbol [nb 2] Name Symbol Luminous energy: Q v [nb 3] lumen second: lm⋅s T⋅J: The lumen second is sometimes called the talbot. Luminous flux, luminous power Φ v [nb 3] lumen (= candela steradian) lm (= cd⋅sr) J: Luminous energy per unit time Luminous intensity: I v: candela (= lumen per steradian) cd (= lm/sr) J: Luminous flux per unit ...

  7. Luminous flux - Wikipedia

    en.wikipedia.org/wiki/Luminous_flux

    Symbol [nb 2] Name Symbol Luminous energy: Q v [nb 3] lumen second: lm⋅s T⋅J: The lumen second is sometimes called the talbot. Luminous flux, luminous power Φ v [nb 3] lumen (= candela steradian) lm (= cd⋅sr) J: Luminous energy per unit time Luminous intensity: I v: candela (= lumen per steradian) cd (= lm/sr) J: Luminous flux per unit ...

  8. Category:Units of photometry - Wikipedia

    en.wikipedia.org/wiki/Category:Units_of_photometry

    Symbol [nb 2] Name Symbol Luminous energy: Q v [nb 3] lumen second: lm⋅s T⋅J: The lumen second is sometimes called the talbot. Luminous flux, luminous power Φ v [nb 3] lumen (= candela steradian) lm (= cd⋅sr) J: Luminous energy per unit time Luminous intensity: I v: candela (= lumen per steradian) cd (= lm/sr) J: Luminous flux per unit ...

  9. SI derived unit - Wikipedia

    en.wikipedia.org/wiki/SI_derived_unit

    Symbol Quantity Expression in terms of SI base units lumen second: lm⋅s luminous energy: s⋅cd lux second: lx⋅s luminous exposure: m −2 ⋅s⋅cd candela per square metre: cd/m 2: luminance: m −2 ⋅cd lumen per watt: lm/W luminous efficacy: m −2 ⋅kg −1 ⋅s 3 ⋅cd