Luminous energy

Luminous energy

In photometry, luminous energy is the perceived energy of light. This is sometimes also called the quantity of light.

Luminous energy is not the same as the radiant energy, the corresponding objective physical quantity. This is because the human eye can only see light in the visible spectrum and has different sensitivities to light of different wavelengths within the spectrum. When adapted for bright conditions (photopic vision), the eye is most sensitive to light at a wavelength of 555 nm. Light with the same power at longer or shorter wavelengths has a lower luminous energy.

Units

The SI unit of luminous energy is the lumen second, which is unofficially known as the Talbot in honor of William Henry Fox Talbot.

In other systems of units, luminous energy may be expressed in basic units of energy.

ee also

*Coefficient of utilization
*Radiant energy


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Look at other dictionaries:

  • luminous energy — n. LIGHT1 (sense 1a) …   English World dictionary

  • luminous energy — noun the energy associated with visible light • Hypernyms: ↑radiant energy * * * noun : energy transferred by or in the form of visible radiation compare radiant energy * * * light1 (def. 2a). [1930 35] * * * luminous energy noun Energy emitted… …   Useful english dictionary

  • luminous energy — šviesos energija statusas T sritis Standartizacija ir metrologija apibrėžtis Dydis, lygus pastoviojo šviesos srauto ir jo veikimo trukmės sandaugai. atitikmenys: angl. luminous energy; quantity of light vok. Energie des Lichtes, f; Lichtenergie,… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • luminous energy — šviesos energija statusas T sritis Standartizacija ir metrologija apibrėžtis Šviesos srauto pagal laiką integralas. atitikmenys: angl. luminous energy; quantity of light vok. Energie des Lichtes, f; Lichtenergie, f rus. световая энергия, f pranc …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • luminous energy — šviesos energija statusas T sritis fizika atitikmenys: angl. luminous energy vok. Lichtenergie, f rus. световая энергия, f pranc. énergie lumineuse, f …   Fizikos terminų žodynas

  • luminous energy — /lumənəs ˈɛnədʒi/ (say loohmuhnuhs enuhjee) noun 1. light. 2. Optics the time integral of luminous flux …  

  • luminous energy — noun Date: 1898 energy transferred in the form of visible radiation …   New Collegiate Dictionary

  • luminous energy — noun The radiant energy of the visible portion of a spectrum of light …   Wiktionary

  • luminous energy — light1 (def. 2a). [1930 35] * * * …   Universalium

  • Luminous efficacy — is a measure of how well a light source produces visible light. It is the ratio of luminous flux to power. Depending on context, the power can be either the radiant flux of the source s output, or it can be the total electric power consumed by… …   Wikipedia

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