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Section 7-316 entries

7-31.1absorptance 7-31.2luminous absorptance 7-31.3reflectance 7-31.4luminous reflectance 7-31.5transmittance 7-31.6luminous transmittance

7-31.6

luminous transmittance

URNurn:iso:std:iso:80000:-7:ed-2:en:item:7-31.6

Download RDF.jsonld .ttl

https://metanorma.github.io/isq-smart/quantities/part-7/t7-31.6
urn:iso:std:iso:80000:-7:ed-2:en:item:7-31.6

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-7:ed-2:en:item:7-31.6

IEC

urn:iec:std:iec:80000-7:2019:::item:7-31.6

Designations

ENluminous transmittance

FRfacteur de transmission lumineuse

Symbol

τ_{v}

Notation systems

Rendered

τ_{v}

AsciiMath

tau_"v"

LaTeX

\tau_{\text{v}}

Definition

quotient of transmitted luminous flux and incident luminous flux, expressed by

τ_{v} = \frac{Φ_{v,t}}{Φ_{v,m}}

where $Φ_{v,t}$ is transmitted luminous flux (luminous flux) and $Φ_{v,m}$ is luminous flux of the incident radiation

quotient du flux lumineux transmis par le flux lumineux incident, exprimé par

τ_{v} = \frac{Φ_{v,t}}{Φ_{v,m}}

où $Φ_{v,t}$ est le flux lumineux (luminous flux) transmis et $Φ_{v,m}$ est le flux lumineux du rayonnement incident

Units

1

one

View related quantities →

Notes

From the spectral transmittance $τ (λ)$ , luminous transmittance can be calculated by

τ_{v} = \frac{\int_{0}^{\infty} τ (λ) Φ_{e, λ} (λ) V (λ) d λ}{\int_{0}^{\infty} Φ_{e, λ} (λ) V (λ) d λ}

where $Φ_{e, λ} (λ)$ is the spectral radiant flux (or relative spectral distribution) of the source, and $V (λ)$ is the spectral luminous efficiency (spectral luminous efficiency <specified photometric condition>).

Broader concepts

◇ dimensionless quantities

Characterizes

● source

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:t7-31.6

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	7-31.6
skosxl:prefLabel	"luminous transmittance"@en
skosxl:altLabel	"tau_"v""@en
skos:definition	quotient of transmitted luminous flux and incident luminous flux, expressed by [stem%unnumbered] ++++ tau_"v" = (Phi_"v…
skos:note	From the spectral transmittance stem:[tau(lambda)], luminous transmittance can be calculated by [stem%unnumbered] ++++ …
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