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单词 luminous flux
释义

luminous flux


luminous flux

n. The flow of light per unit of time, especially the flux of visible light expressed in lumens.

luminous flux

n (Units) a measure of the rate of flow of luminous energy, evaluated according to its ability to produce a visual sensation. For a monochromatic light it is the radiant flux multiplied by the spectral luminous efficiency of the light. It is measured in lumens. Symbol: Φv

lu′minous flux′


n. the rate of transmission of light, expressed in lumens. [1925–30]
Thesaurus
Noun1.luminous flux - the rate of flow of light energyradiant flux - the rate of flow of radiant energy (electromagnetic waves)

luminous flux


Luminous flux

The time rate of flow of light. It is radiant flux in the form of electromagnetic waves which affects the eye or, more strictly, the time rate of flow of radiant energy evaluated according to its capacity to produce visual sensation. The visible spectrum is ordinarily considered to extend from 380 to 760 nanometers in wavelength; therefore, luminous flux is radiant flux in that region of the electromagnetic spectrum. The unit of measure of luminous flux is the lumen. See Photometry

Luminous flux

The rate of flow of light, analogous to the rate of flow of a fluid.

Luminous Flux

 

a photometric quantity. Luminous flux is radiant flux—that is, the power of the optical radiation —evaluated with respect to its capacity to produce visual sensation. More precisely, luminous flux is radiant flux evaluated according to its action on a selective optical detector whose spectral sensitivity is defined as a function of the spectral luminous efficiency V(λ), where λ is the wavelength of the light in a vacuum. The unit of luminous flux is the lumen. The relation between the luminous flux Фv and the radiant flux Фe is given by the equation

Here, Km is the maximum value of the spectral luminous efficacy; Km ≈ 680 lumens per watt at a wavelength of 555 nanometers.

luminous flux

[′lü·mə·nəs ′fləks] (optics) The time rate of flow of radiant energy, evaluated according to its capacity to produce visual sensations; measured in lumens.

luminous flux

The rate-of-flow of radiant energy emitted by a lamp.

luminous flux

The energy field generated by light. See lumen.

luminous flux


lu·mi·nous flux

the quantity of light emitted from a point source in a given time; its unit is the lumen.

flux, luminous

Flow of light which produces a visual sensation. It is measured in lumens.

luminous flux


Related to luminous flux: Luminous efficacy, luminous flux density
  • noun

Words related to luminous flux

noun the rate of flow of light energy

Related Words

  • radiant flux
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