Logo
Unionpedia
Communication
Get it on Google Play
New! Download Unionpedia on your Android™ device!
Install
Faster access than browser!
 

Candela

Index Candela

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. [1]

44 relations: Adaptation (eye), Black body, Candle, Candlepower, Coherence (physics), Foot-candle, General Conference on Weights and Measures, Grain (unit), Green, Hefner lamp, Human eye, Illuminance, International Commission on Illumination, International System of Units, Jules Violle, Latin, Light, Light meter, Light-emitting diode, Lumen (unit), Luminosity function, Luminous flux, Luminous intensity, Multifaceted reflector, National Institute of Standards and Technology, Normal (geometry), Operational definition, Photopic vision, Planck's law, Platinum, Proposed redefinition of SI base units, Radiant intensity, Radiometry, Scotopic vision, Second, SI base unit, Solid angle, Spectrum, Spermaceti, Square metre, Steradian, Watt, Wavelength, Weighting.

Adaptation (eye)

In ocular physiology, adaptation is the ability of the eye to adjust to various levels of light.

New!!: Candela and Adaptation (eye) · See more »

Black body

A black body is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence.

New!!: Candela and Black body · See more »

Candle

A candle is an ignitable wick embedded in wax, or another flammable solid substance such as tallow, that provides light, and in some cases, a fragrance.

New!!: Candela and Candle · See more »

Candlepower

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

New!!: Candela and Candlepower · See more »

Coherence (physics)

In physics, two wave sources are perfectly coherent if they have a constant phase difference and the same frequency, and the same waveform.

New!!: Candela and Coherence (physics) · See more »

Foot-candle

A foot-candle (sometimes foot candle; abbreviated fc, lm/ft2, or sometimes ft-c) is a non-SI unit of illuminance or light intensity.

New!!: Candela and Foot-candle · See more »

General Conference on Weights and Measures

The General Conference on Weights and Measures (Conférence générale des poids et mesures – CGPM) is the supreme authority of the International Bureau of Weights and Measures (Bureau international des poids et mesures – BIPM), the inter-governmental organization established in 1875 under the terms of the Metre Convention (Convention du Mètre) through which Member States act together on matters related to measurement science and measurement standards.

New!!: Candela and General Conference on Weights and Measures · See more »

Grain (unit)

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

New!!: Candela and Grain (unit) · See more »

Green

Green is the color between blue and yellow on the visible spectrum.

New!!: Candela and Green · See more »

Hefner lamp

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

New!!: Candela and Hefner lamp · See more »

Human eye

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

New!!: Candela and Human eye · See more »

Illuminance

In photometry, illuminance is the total luminous flux incident on a surface, per unit area.

New!!: Candela and Illuminance · See more »

International Commission on Illumination

The International Commission on Illumination (usually abbreviated CIE for its French name, Commission internationale de l'éclairage) is the international authority on light, illumination, colour, and colour spaces.

New!!: Candela and International Commission on Illumination · See more »

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.

New!!: Candela and International System of Units · See more »

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.

New!!: Candela and Jules Violle · See more »

Latin

Latin (Latin: lingua latīna) is a classical language belonging to the Italic branch of the Indo-European languages.

New!!: Candela and Latin · See more »

Light

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

New!!: Candela and Light · See more »

Light meter

A light meter is a device used to measure the amount of light.

New!!: Candela and Light meter · See more »

Light-emitting diode

A light-emitting diode (LED) is a two-lead semiconductor light source.

New!!: Candela and Light-emitting diode · See more »

Lumen (unit)

The lumen (symbol: lm) is the SI derived unit of luminous flux, a measure of the total quantity of visible light emitted by a source.

New!!: Candela and Lumen (unit) · See more »

Luminosity function

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

New!!: Candela and Luminosity function · See more »

Luminous flux

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

New!!: Candela and Luminous flux · See more »

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.

New!!: Candela and Luminous intensity · See more »

Multifaceted reflector

A multifaceted reflector (often abbreviated MR) light bulb is a reflector housing format for halogen as well as some LED and fluorescent lamps.

New!!: Candela and Multifaceted reflector · See more »

National Institute of Standards and Technology

The National Institute of Standards and Technology (NIST) is one of the oldest physical science laboratories in the United States.

New!!: Candela and National Institute of Standards and Technology · See more »

Normal (geometry)

In geometry, a normal is an object such as a line or vector that is perpendicular to a given object.

New!!: Candela and Normal (geometry) · See more »

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.

New!!: Candela and Operational definition · See more »

Photopic vision

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

New!!: Candela and Photopic vision · See more »

Planck's law

Planck's law describes the spectral density of electromagnetic radiation emitted by a black body in thermal equilibrium at a given temperature T. The law is named after Max Planck, who proposed it in 1900.

New!!: Candela and Planck's law · See more »

Platinum

Platinum is a chemical element with symbol Pt and atomic number 78.

New!!: Candela and Platinum · See more »

Proposed redefinition of SI base units

The International Committee for Weights and Measures (CIPM) has proposed revised definitions of the SI base units, for consideration at the 26th General Conference on Weights and Measures (CGPM).

New!!: Candela and Proposed redefinition of SI base units · See more »

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.

New!!: Candela and Radiant intensity · See more »

Radiometry

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

New!!: Candela and Radiometry · See more »

Scotopic vision

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

New!!: Candela and Scotopic vision · See more »

Second

The second is the SI base unit of time, commonly understood and historically defined as 1/86,400 of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each.

New!!: Candela and Second · See more »

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.

New!!: Candela and SI base unit · See more »

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.

New!!: Candela and Solid angle · See more »

Spectrum

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.

New!!: Candela and Spectrum · See more »

Spermaceti

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).

New!!: Candela and Spermaceti · See more »

Square metre

The square metre (International spelling as used by the International Bureau of Weights and Measures) or square meter (American spelling) is the SI derived unit of area, with symbol m2 (Unicode character). It is the area of a square whose sides measure exactly one metre.

New!!: Candela and Square metre · See more »

Steradian

No description.

New!!: Candela and Steradian · See more »

Watt

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

New!!: Candela and Watt · See more »

Wavelength

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

New!!: Candela and Wavelength · See more »

Weighting

The process of weighting involves emphasizing the contribution of some aspects of a phenomenon (or of a set of data) to a final effect or result, giving them more weight in the analysis.

New!!: Candela and Weighting · See more »

Redirects here:

Candela (unit), Candela unit, Candelas, Candella, Candle (unit), Hectocandela, Kilocandela, Megacandela, Millicandela, Neue Kerze, New candle, New candle unit, Zeptocandela, .

References

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

OutgoingIncoming
Hey! We are on Facebook now! »