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Luminous intensity

Index Luminous intensity

In photometry, luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function, a standardized model of the sensitivity of the human eye. [1]

32 relations: Brightness, Candela, Candlepower, England, Grain (unit), Hefner lamp, Human eye, International System of Quantities, International System of Units, Jules Violle, Light, Luminosity function, Luminous flux, Nanometre, Operational definition, Photometry (optics), Photopic vision, Physical quantity, Power (physics), Radiance, Radiant flux, Radiant intensity, Radiometry, Scotopic vision, SI base unit, Solid angle, Spectrum, Spermaceti, Steradian, Visible spectrum, Watt, Wavelength.


Brightness is an attribute of visual perception in which a source appears to be radiating or reflecting light.

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The candela (or; symbol: cd) is the base unit of luminous intensity in the International System of Units (SI); that is, luminous power per unit solid angle emitted by a point light source in a particular direction.

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Candlepower (abbreviated as cp or CP) is an obsolete unit expressing luminous intensity, equal to 0.981 candelas.

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England is a country that is part of the United Kingdom.

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Grain (unit)

A grain is a unit of measurement of mass, and in the troy weight, avoirdupois, and Apothecaries' system, equal to exactly.

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Hefner lamp

The Hefner lamp, or in German Hefnerkerze, is a flame lamp used in photometry that burns amyl acetate.

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Human eye

The human eye is an organ which reacts to light and pressure.

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International System of Quantities

The International System of Quantities (ISQ) is a system based on seven base quantities: length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity.

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International System of Units

The International System of Units (SI, abbreviated from the French Système international (d'unités)) is the modern form of the metric system, and is the most widely used system of measurement.

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Jules Violle

Jules Louis Gabriel Violle (16 November 1841, Langres, Haute-Marne – 12 September 1923, Fixin, Bourgogne-Franche-Comté) was a French physicist and inventor.

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Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum.

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Luminosity function

A luminosity function or luminous efficiency function describes the average spectral sensitivity of human visual perception of brightness.

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Luminous flux

In photometry, luminous flux or luminous power is the measure of the perceived power of light.

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The nanometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: nm) or nanometer (American spelling) is a unit of length in the metric system, equal to one billionth (short scale) of a metre (m).

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Operational definition

An operational definition is the articulation of operationalization (or statement of procedures) used in defining the terms of a process (or set of validation tests) needed to determine the nature of an item or phenomenon (a variable, term, or object) and its properties such as duration, quantity, extension in space, chemical composition, etc.

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Photometry (optics)

Photometry is the science of the measurement of light, in terms of its perceived brightness to the human eye.

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Photopic vision

Photopic vision is the vision of the eye under well-lit conditions (luminance level 10 to 108 cd/m2).

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Physical quantity

A physical quantity is a physical property of a phenomenon, body, or substance, that can be quantified by measurement.or we can say that quantities which we come across during our scientific studies are called as the physical quantities...

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Power (physics)

In physics, power is the rate of doing work, the amount of energy transferred per unit time.

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In radiometry, radiance is the radiant flux emitted, reflected, transmitted or received by a given surface, per unit solid angle per unit projected area.

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Radiant flux

In radiometry, radiant flux or radiant power is the radiant energy emitted, reflected, transmitted or received, per unit time, and spectral flux or spectral power is the radiant flux per unit frequency or wavelength, depending on whether the spectrum is taken as a function of frequency or of wavelength.

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Radiant intensity

In radiometry, radiant intensity is the radiant flux emitted, reflected, transmitted or received, per unit solid angle, and spectral intensity is the radiant intensity per unit frequency or wavelength, depending on whether the spectrum is taken as a function of frequency or of wavelength.

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Radiometry is a set of techniques for measuring electromagnetic radiation, including visible light.

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Scotopic vision

Scotopic vision is the vision of the eye under low-light levels.

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SI base unit

The International System of Units (SI) defines seven units of measure as a basic set from which all other SI units can be derived.

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Solid angle

In geometry, a solid angle (symbol) is a measure of the amount of the field of view from some particular point that a given object covers.

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A spectrum (plural spectra or spectrums) is a condition that is not limited to a specific set of values but can vary, without steps, across a continuum.

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Spermaceti (from Greek sperma meaning "seed", and ceti, the genitive form of "whale") is a waxy substance found in the head cavities of the sperm whale (and, in smaller quantities, in the oils of other whales).

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No description.

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Visible spectrum

The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye.

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The watt (symbol: W) is a unit of power.

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In physics, the wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats.

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[1] https://en.wikipedia.org/wiki/Luminous_intensity

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