Dictionary:
luminous energy
n.
The radiant energy of electromagnetic waves in the visible portion of the electromagnetic spectrum.
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n.
Sci-Tech Encyclopedia:
Luminous energy
The radiant energy in the visible region or quantity of light. It is in the form of electromagnetic waves, and since the visible region is commonly taken as extending 380–760 nanometers in wavelength, the luminous energy is contained within that region. It is equal to the time integral of the production of the luminous flux. See also Photometry.
Architecture:
luminous energy
The time integral of luminous flux; given by the product of the luminous flux and the time that the flux is maintained, if the luminous flux is of constant value; usually expressed in lumen-hours.
WordNet:
luminous energy
Note: click on a word meaning below to see its connections and related words.
The noun has one meaning:
Meaning #1:
the energy associated with visible light
Wikipedia:
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 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.
See also
| Quantity | Symbol | SI unit | Abbr. | Notes | ||||
|---|---|---|---|---|---|---|---|---|
| Luminous energy | Qv | lumen second | lm·s | units are sometimes called talbots | ||||
| Luminous flux | F | lumen (= cd·sr) | lm | also called luminous power | ||||
| Luminous intensity | Iv | candela (= lm/sr) | cd | an SI base unit | ||||
| Luminance | Lv | candela per square metre | cd·m–2 | units are sometimes called nits | ||||
| Illuminance | Ev | lux (= lm·m–2) | lx | Used for light incident on a surface | ||||
| Luminous emittance | Mv | lux (= lm·m–2) | lx | Used for light emitted from a surface | ||||
| Luminous efficacy | - - - - | lumen per watt | lm/W | ratio of luminous flux to radiant flux; maximum possible is 683.002 | ||||
| Units-interrelation diagram (full page) | ||||||||
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Copyrights:
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 | Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2007. Published by Houghton Mifflin Company. All rights reserved. Read more |
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| Sci-Tech Encyclopedia. McGraw-Hill Encyclopedia of Science and Technology. Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved. Read more |
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| Architecture. McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc. All rights reserved. Read more |
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| WordNet. WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved. Read more |
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| Wikipedia. This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Luminous energy". Read more |
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Keep Reading
Mentioned In:
- talbot (optics)
- lumberg (optics)
- lumen-hour (optics)
- lumen-second (optics)
- lumen (technology)
- luminescent dye (materials)
- photometry (photography)
- Luminous efficacy (optics)
- MKS system
- Ectoplasm (parapsychology)
- talbot (photometry)
- Materialization (parapsychology)
- coefficient of utilization
- Candela per square metre
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