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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

7-11.1

luminous efficacy of radiation

URNurn:iso:std:iso:80000:-7:ed-2:en:item:7-11.1

Download RDF.jsonld .ttl

https://metanorma.github.io/isq-smart/quantities/part-7/t7-11.1
urn:iso:std:iso:80000:-7:ed-2:en:item:7-11.1

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-7:ed-2:en:item:7-11.1

IEC

urn:iec:std:iec:80000-7:2019:::item:7-11.1

Designations

ENluminous efficacy of radiation

FRefficacité lumineuse d'un rayonnement

Symbol

K

Notation systems

Rendered

K

AsciiMath

K

LaTeX

K

Definition

quotient of luminous flux (luminous flux) and the corresponding radiant flux (radiant flux) for a specified photometric condition

quotient du flux lumineux (luminous flux) par le flux énergétique correspondant (radiant flux) 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

Luminous efficacy of radiation for photopic vision is expressed by

K = \frac{Φ_{v}}{Φ_{e}}

where $Φ_{v}$ is luminous flux (luminous flux) and $Φ_{e}$ is radiant flux (radiant flux).

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

Symbols for different photometric conditions:

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

L'efficacité lumineuse d'un rayonnement en vision photopique est exprimée par

K = \frac{Φ_{v}}{Φ_{e}}

où $Φ_{v}$ est le flux lumineux (luminous flux) et $Φ_{e}$ est le flux énergétique (radiant flux).

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

Symboles pour différentes conditions photométriques:

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

Referenced by

luminous efficiency <specified photometric condition>

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:t7-11.1

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	7-11.1
skosxl:prefLabel	"luminous efficacy of radiation <specified photometric condition>"@en
skosxl:altLabel	"K"@en
skos:definition	quotient of luminous flux (<<t7-13>>) and the corresponding radiant flux (<<t7-4.1>>) for a specified photometric condit…
skos:note	Luminous efficacy of radiation for photopic vision is expressed by [stem%unnumbered] ++++ K = (Phi_"v")/(Phi_"e") ++++ …
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