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Section 7-114 entries

7-11.1luminous efficacy of radiation <specified photometric condition>7-11.2spectral luminous efficacy <specified photometric condition>7-11.3maximum luminous efficacy <specified photometric condition>7-11.4luminous efficacy of a source

7-11.2

spectral luminous efficacy

URNurn:iso:std:iso:80000:-7:ed-2:en:item:7-11.2

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https://metanorma.github.io/isq-smart/quantities/part-7/t7-11.2
urn:iso:std:iso:80000:-7:ed-2:en:item:7-11.2

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-7:ed-2:en:item:7-11.2

IEC

urn:iec:std:iec:80000-7:2019:::item:7-11.2

Designations

ENspectral luminous efficacy

FRefficacité lumineuse spectrale

Symbol

K (λ)

Notation systems

Rendered

K (λ)

AsciiMath

K(lambda)

LaTeX

K ( \lambda )

Definition

product of spectral luminous efficiency (spectral luminous efficiency <specified photometric condition>) and maximum luminous efficacy (maximum luminous efficacy <specified photometric condition>) for a specified photometric condition

produit de l'efficacité lumineuse relative spectrale (spectral luminous efficiency <specified photometric condition>) par l'efficacité lumineuse maximale (maximum luminous efficacy <specified photometric condition>) pour une condition photométrique spécifiée

Units

l \frac{m}{W}

lumen per watt

View related quantities →

c d \cdot s r \cdot k g^{- 1} \cdot m^{- 2} \cdot s^{3}

candela steradian second cubed per kilogram square metre

View related quantities →

Notes

Spectral luminous efficacy for photopic vision is expressed by

K (λ) = K_{m} V (λ)

where $K_{m}$ is maximum luminous efficacy (maximum luminous efficacy <specified photometric condition>), $V (λ)$ is spectral luminous efficiency (spectral luminous efficiency <specified photometric condition>) and $λ$ is wavelength.

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

Symbols for different photometric conditions:

$K (λ)$ , ; $K' (λ)$ , ; $K_{mes;m} (λ)$ , ; $K_{10} (λ)$ , ; $K_{M} (λ)$ , .

L'efficacité lumineuse spectrale en vision photopique est exprimée par

K (λ) = K_{m} V (λ)

où $K_{m}$ est l'efficacité lumineuse maximale (maximum luminous efficacy <specified photometric condition>), $V (λ)$ est l'efficacité lumineuse relative spectrale (spectral luminous efficiency <specified photometric condition>) et $λ$ est la longueur d'onde.

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

Symboles pour différentes conditions photométriques:

$K (λ)$ , ; $K' (λ)$ , ; $K_{mes;m} (λ)$ , ; $K_{10} (λ)$ , ; $K_{M} (λ)$ , .

Concept HierarchyPendrill (2024)

L⁻² M⁻¹ T³ JL⁻² M⁻¹ T³ J quantitiesLevel 0 · Kind

Broader concepts

◇ L⁻² M⁻¹ T³ J 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:t7-11.2

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	7-11.2
skosxl:prefLabel	"spectral luminous efficacy <specified photometric condition>"@en
skosxl:altLabel	"K(lambda)"@en
skos:definition	product of spectral luminous efficiency (<<t7-10.2>>) and maximum luminous efficacy (<<t7-11.3>>) for a specified photom…
skos:note	Spectral luminous efficacy for photopic vision is expressed by [stem%unnumbered] ++++ K(lambda) = K_"m" V(lambda) ++++ …
isq:hasUnit	lm/W (lumen per watt)cdsrkg^(-1)m^(-2)s^3 (candela steradian second cubed per kilogram square metre)
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