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7-13

luminous flux

URNurn:iso:std:iso:80000:-7:ed-2:en:item:7-13

https://metanorma.github.io/isq-smart/quantities/part-7/t7-13
urn:iso:std:iso:80000:-7:ed-2:en:item:7-13

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-7:ed-2:en:item:7-13

IEC

urn:iec:std:iec:80000-7:2019:::item:7-13

Designations

ENluminous flux

FRflux lumineux

Symbol

Φ_{v}

(Φ)

Notation systems

Rendered

Φ_{v}

Rendered

(Φ)

AsciiMath

Phi_"v"

AsciiMath

(Phi)

LaTeX

\Phi_{\text{v}}

LaTeX

( \Phi )

Definition

change in luminous energy with time, expressed by

Φ_{v} = \frac{d Q_{v}}{d t}

where $Q_{v}$ is the luminous energy (luminous energy) emitted, transferred or received and $t$ is time (ISO 80000-3: Space and time)

variation de la quantité de lumière dans le temps, exprimée par

Φ_{v} = \frac{d Q_{v}}{d t}

où $Q_{v}$ est la quantité de lumière (luminous energy) émise, transportée ou reçue et $t$ est le temps (ISO 80000-3: Space and time)

Units

l m

lumen

View related quantities →

c d \cdot s r

candela steradian

View related quantities →

Notes

Luminous flux is a quantity derived from the radiant flux (radiant flux), $Φ_{e}$ , by evaluating the radiation according to its action upon the CIE standard photometric observer. (See cie017,locality:term=17-738.)

Luminous flux can be derived from the spectral radiant flux distribution by

Φ_{v} = K_{m} \int_{0}^{\infty} Φ_{e, λ} (λ) V (λ) d λ

where $K_{m}$ is maximum luminous efficacy (maximum luminous efficacy <specified photometric condition>), $Φ_{e, λ} (λ)$ is spectral radiant flux (spectral radiant flux), $V (λ)$ is spectral luminous efficiency (spectral luminous efficiency <specified photometric condition>) and $λ$ is wavelength (ISO 80000-3: Space and time).

The corresponding radiometric quantity is "radiant flux" (radiant flux). The corresponding quantity for photons is "photon flux" (photon flux).

Le flux lumineux est une grandeur déduite du flux énergétique (radiant flux), $Φ_{e}$ , par l'évaluation du rayonnement d'après son action sur l'observateur de référence photométrique CIE. (Voir cie017,locality:term=17-738.)

Le flux lumineux peut être déduit de la répartition du flux énergétique spectrique par

Φ_{v} = K_{m} \int_{0}^{\infty} Φ_{e, λ} (λ) V (λ) d λ

où $K_{m}$ est l'efficacité lumineuse maximale (maximum luminous efficacy <specified photometric condition>), $Φ_{e, λ} (λ)$ est le flux énergétique spectrique (spectral radiant flux), $V (λ)$ est l'efficacité lumineuse relative spectrale (spectral luminous efficiency <specified photometric condition>) et $λ$ est la longueur d'onde (ISO 80000-3: Space and time).

La grandeur radiométrique correspondante est le «flux énergétique» (radiant flux). La grandeur photonique correspondante est le «flux photonique» (photon flux).

Referenced by

radiant flux luminous efficacy of radiation <specified photometric condition>luminous efficacy of a source luminous energy luminous intensity illuminance luminous exitance photon flux luminous absorptance luminous reflectance luminous transmittance reflectance factor

Concept HierarchyPendrill (2024)

Jluminous intensity-type quantitiesLevel 0 · Kind

Broader concepts

◇ luminous intensity-type quantities

Characterizes

● photon

Ontology
isq:Quantity smart:TermEntry

Class Hierarchy

smart:Entity smart:TermEntryisq:Quantity

A physical quantity as defined in ISO/IEC 80000, with associated symbols, definitions, and units of measurement.

Instance IRI

isq:t7-13

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	7-13
skosxl:prefLabel	"luminous flux"@en
skosxl:altLabel	"Phi_"v""@en"(Phi)"@en
skos:definition	change in luminous energy with time, expressed by [stem%unnumbered] ++++ Phi_"v" = ("d"Q_"v")/("d"t) ++++ where stem:[…
skos:note	Luminous flux is a quantity derived from the radiant flux (<<t7-4.1>>), stem:[Phi_"e"], by evaluating the radiation acco…
isq:hasUnit	lm (lumen)cd*sr (candela steradian)
isq:hasDimension	isq:Dimension
smart:hasBindingnessType	bindingness-type:normative
dcterms:isPartOf	isq:part-7

Related Entities

isq:QuantityShape isq:part-7 isq:Unit isq:Dimension isq:hasDimension smart:TermEntry