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Section 7-102 entries

7-10.1luminous efficiency <specified photometric condition>7-10.2spectral luminous efficiency <specified photometric condition>

7-10.1

luminous efficiency

URNurn:iso:std:iso:80000:-7:ed-2:en:item:7-10.1

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urn:iso:std:iso:80000:-7:ed-2:en:item:7-10.1

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-7:ed-2:en:item:7-10.1

IEC

urn:iec:std:iec:80000-7:2019:::item:7-10.1

Designations

ENluminous efficiency

FRefficacité lumineuse relative

Symbol

V

Notation systems

Rendered

V

AsciiMath

V

LaTeX

V

Definition

quotient of radiant flux (radiant flux) weighted by the spectral luminous efficiency (spectral luminous efficiency <specified photometric condition>) and the corresponding radiant flux for a specified photometric condition

quotient du flux énergétique (radiant flux) pondéré par l'efficacité lumineuse relative spectrale (spectral luminous efficiency <specified photometric condition>) par le flux énergétique correspondant pour une condition photométrique spécifiée

Units

1

one

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Notes

Luminous efficiency for photopic vision is expressed by

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

where $Φ_{e, λ}$ is spectral radiant flux (spectral radiant flux), $V (λ)$ is spectral luminous efficiency, $λ$ is wavelength, $K$ is luminous efficacy of radiation (luminous efficacy of radiation <specified photometric condition>), and $K_{m}$ is maximum luminous efficacy (maximum luminous efficacy <specified photometric condition>).

For scotopic and mesopic vision see cls-0.4 and cls-0.5.

Symbols for different photometric conditions:

$V$ , ; $V'$ , ; $V_{mes;m}$ , ; $V_{10}$ , ; $V_{M}$ , .

L'efficacité lumineuse relative en vision photopique est exprimée par

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

où $Φ_{e, λ}$ est le flux énergétique spectrique (spectral radiant flux), $V (λ)$ est l'efficacité lumineuse relative spectrale, $λ$ est la longueur d'onde, $K$ est l'efficacité lumineuse du rayonnement (luminous efficacy of radiation <specified photometric condition>) et $K_{m}$ est l'efficacité lumineuse maximale (maximum luminous efficacy <specified photometric condition>).

En vision scotopique et mésopique, voir cls-0.4 et cls-0.5.

Symboles pour différentes conditions photométriques:

$V$ , ; $V'$ , ; $V_{mes;m}$ , ; $V_{10}$ , ; $V_{M}$ , .

Concept HierarchyPendrill (2024)

1dimensionless quantitiesLevel 0 · Kind

Broader concepts

◇ dimensionless quantities

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:t7-10.1

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	7-10.1
skosxl:prefLabel	"luminous efficiency <specified photometric condition>"@en
skosxl:altLabel	"V"@en
skos:definition	quotient of radiant flux (<<t7-4.1>>) weighted by the spectral luminous efficiency (<<t7-10.2>>) and the corresponding r…
skos:note	Luminous efficiency for photopic vision is expressed by [stem%unnumbered] ++++ V = (int_0^(oo)Phi_("e",lambda)(lambda)V…
isq:hasUnit	1 (one)
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