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7-17

luminous exitance

URNurn:iso:std:iso:80000:-7:ed-2:en:item:7-17

https://metanorma.github.io/isq-smart/quantities/part-7/t7-17
urn:iso:std:iso:80000:-7:ed-2:en:item:7-17

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-7:ed-2:en:item:7-17

IEC

urn:iec:std:iec:80000-7:2019:::item:7-17

Designations

ENluminous exitance

FRexitance lumineuse

Symbol

M_{v}

(M)

Notation systems

Rendered

M_{v}

Rendered

(M)

AsciiMath

M_"v"

AsciiMath

(M)

LaTeX

M_{\text{v}}

LaTeX

( M )

Definition

density of exiting luminous flux with respect to area at a point on a real or imaginary surface, expressed by

M_{v} = \frac{d Φ_{v}}{d A}

where $Φ_{v}$ is luminous flux (luminous flux) and $A$ is the area (ISO 80000-3: Space and time) from which the luminous flux leaves

dérivée du flux lumineux sortant par rapport à l'aire, en un point d'une surface réelle ou fictive, exprimée par

M_{v} = \frac{d Φ_{v}}{d A}

où $Φ_{v}$ est le flux lumineux (luminous flux) et $A$ est l'aire (ISO 80000-3: Space and time) de la surface quittée par le flux lumineux

Units

l \frac{m}{m^{2}}

lumen per square metre

View related quantities →

c d \cdot s r \cdot m^{- 2}

candela steradian per square metre

View related quantities →

Notes

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

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

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

Integral limits can be confined depending on the spectral sensitivity of the detectors used as a sensor.

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

L'exitance lumineuse peut être déduite de la répartition de l'exitance énergétique spectrique par

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

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

Les limites de l'intégrale peuvent être resserrées selon la sensibilité spectrale des détecteurs utilisés comme capteur.

La grandeur radiométrique correspondante est l'«exitance énergétique» (radiant exitance). La grandeur photonique correspondante est l'«exitance photonique» (photon exitance).

Referenced by

radiant exitance photon exitance

Concept HierarchyPendrill (2024)

L⁻² JL⁻² J quantitiesLevel 0 · Kind

Broader concepts

◇ L⁻² J 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:t7-17

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	7-17
skosxl:prefLabel	"luminous exitance"@en
skosxl:altLabel	"M_"v""@en"(M)"@en
skos:definition	density of exiting luminous flux with respect to area at a point on a real or imaginary surface, expressed by [stem%unn…
skos:note	Luminous exitance can be derived from the spectral radiant exitance distribution by [stem%unnumbered] ++++ M_"v" = K_"m…
isq:hasUnit	lm/m^2 (lumen per square metre)cdsrm^(-2) (candela steradian per 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