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  Encyclopedia of Keywords > Candela > Luminous Intensity   Michael Charnine

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  1. Luminous intensity is a much more useful measure, although lumens per watt is a handy way of comparing the output of otherwise similar lights.
  2. Luminous intensity is the perceived power per unit solid angle.
  3. Luminous intensity is a property of light sources, such as lamps, and traceability is traditionally through the issuance of calibrated standard lamps.
  4. Luminous intensity is rarely used in chemistry and we will not consider it further, but the remaining six base units are essential to chemical studies. (Web site)
  5. Luminous intensity is not the same as the radiant intensity, the corresponding objective physical quantity. (Web site)


  1. Its value is determined by luminous intensity, angle of incidence and distance from the source to the surface.


  1. Luminous Intensity, I, is measured in candles, candlepower, or candela (all the same thing). (Web site)


  1. It was originally defined as the luminous intensity in a horizontal direction of a candle of specified size burning at a specified rate.


  1. A common candle emits light with a luminous intensity of roughly one candela. (Web site)
  2. Measurement of the properties of light, especially luminous intensity. (Web site)


  1. Prior to the definition of the candela, variety of units for luminous intensity were used in various countries. (Web site)
  2. More recently amount of substance and luminous intensity have been added in the International System of Units, or SI. (Web site)

Light Intensity

  1. Lastly equation (2) is placed to the equation(1)) and the luminance is obtained due to luminous intensity(light intensity). (Web site)


  1. The luminous intensity would still be one candela in those directions that are not obscured. (Web site)

Frequency Response

  1. At other frequencies, more radiant intensity is required to achieve the same luminous intensity, according to the frequency response of the human eye.


  1. Such a source could then be used to calibrate instruments designed to measure luminous intensity, for example. (Web site)

Base Unit

  1. It is quite clearly defined in the SI system, in the definition of the base unit of luminous intensity, the candela.


  1. The photometric unit of the intensity (pointance, luminous intensity) is candela [cd]. (Web site)

Electric Current

  1. The base quantities used in the SI are length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity. (Web site)
  2. They are length, mass, time, temperature, Electric current, Luminous intensity and amount of substance. (Web site)

Light Source

  1. Luminance L is the luminous intensity emitted by the surface area of 1 cm² (or 1 m²) of the light source. (Web site)

Luminous Flux

  1. For a point source, luminous intensity is the luminous flux per unit solid angle (i.e.
  2. Luminous flux and luminous intensity are measurements like radiant power and radiant intensity, only adjusted for the sensitivity of the human eye. (Web site)
  3. Luminous intensity should not be confused with another photometric unit, luminous flux, which is the total perceived power emitted in all directions.

Si Unit

  1. The SI unit of luminous intensity is the candela (cd), an SI base unit. (Web site)


  1. Luminance is a photometric measure of the luminous intensity per unit area of light travelling in a given direction. (Web site)
  2. Luminance (also called luminosity) is a photometric measure of the density of luminous intensity in a given direction.
  3. In photometry, luminosity is sometimes incorrectly used to refer to luminance, which is the density of luminous intensity in a given direction.


  1. The SI unit for luminous intensity is the candela, which also has units of watts per steradian. (Web site)
  2. In other words, an isotropic source having a luminous intensity of 1 candela emits 4π lumens into space, which just happens to be 4π steradians.
  3. The SI base unit for photometry is the candela, a measure of luminous intensity.

Luminous Intensity

  1. The SI units for luminous flux are lumens, where a lumen is defined as a luminous intensity of one candela within a solid angle of one steradian. (Web site)
  2. In photometry, luminous intensity is a measure of the perceived power emitted by a light source in a particular direction.
  3. One lux is equal to one lumen per square metre, where 4π lumens is the total luminous flux of a light source of one candela of luminous intensity. (Web site)


  1. Candela
  2. Steradian
  3. Physics > Optics > Light > Luminance
  4. Optics > Light > Photometry > Luminous Flux
  5. Lumens
  6. Books about "Luminous Intensity" in

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  Short phrases about "Luminous Intensity"
  Originally created: June 24, 2008.
  Links checked: May 05, 2013.
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