Luminous-flux
noun, Optics.
1.
the rate of transmission of luminous energy: expressed in lumens.
noun
1.
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 Φv
luminous flux
(l’mə-nəs)
A measure of the radiant power of light emitted from a source without regard for the direction in which it is emitted. It is measured in lumens. See also luminous intensity.
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noun, Optics. 1. the luminous flux in lumens emitted per unit solid angle by a light source, measured in candles. noun 1. a measure of the amount of light that a point source radiates in a given direction. It is expressed by the luminous flux leaving the source in that direction per unit of solid […]
- Luminously
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noun 1. paint containing a phosphor that emits visible light when irradiated with ultraviolet light.
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noun, Navigation. 1. the distance at which a certain light, as that of a lighthouse, is visible in clear weather, disregarding interference from obstructions and from the curvature of the earth and depending on the power of the light.