SIST EN 4731:2018

SLOVENSKI STANDARD
SIST EN 4731:2018
01-julij-2018
$HURQDYWLND6SHNWUDOQDNDNRYRVW/('VYHWLONNLVHXSRUDEOMDMRV
IRWROXPLQLVFHQþQLPLVLVWHPLR]QDþHYDQMD
Aerospace series - Spectral quality of LED luminaires used with photoluminescent
marking systems
Luft- und Raumfahrt - Spektrale Qualität von LED Leuchten zur Verwendung mit
langnachleuchtenden Markierungssystemen
Série aérospatiale - Qualité spectrale des diodes électroluminescentes appliquées aux
systèmes de marquage photoluminescents
Ta slovenski standard je istoveten z: EN 4731:2018
ICS:
29.140.40 Svetila Luminaires
49.060 /HWDOVNDLQYHVROMVND Aerospace electric
HOHNWULþQDRSUHPDLQVLVWHPL equipment and systems
SIST EN 4731:2018 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 4731:2018

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SIST EN 4731:2018


EN 4731
EUROPEAN STANDARD

NORME EUROPÉENNE

May 2018
EUROPÄISCHE NORM
ICS 29.140.99; 49.095
English Version

Aerospace series - Spectral quality of LED luminaires used
with photoluminescent marking systems
Série aérospatiale - Qualité spectrale des luminaires à Luft- und Raumfahrt - Spektrale Qualität von LED
diodes électroluminescentes appliquées aux systèmes Leuchten zur Verwendung mit langnachleuchtenden
de marquage photoluminescents Markierungssystemen
This European Standard was approved by CEN on 20 November 2017.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4731:2018 E
worldwide for CEN national Members.

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SIST EN 4731:2018
EN 4731:2018 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms, definitions and abbreviations . 5
4 Spectral quality . 7
Annex A (informative) Approximated excitation spectrum . 10
A.1 General . 10
A.2 Approximated excitation spectrum Aλ(λ) for typical photoluminescent pigments
based on strontium aluminate . 10
Annex B (informative) Examples of different light spectra . 11
B.1 Example for a single colour LED luminaire . 11
B.2 Example for a multi-colour LED luminaire (white primary mixed with blue primary) . 12
B.3 Example for a multi-colour LED luminaire (all RGBW primaries are mixed) . 13
B.4 Example for a bi-colour LED luminaire (white and amber primaries are mixed) . 14
B.5 Example for a bi-colour LED luminaire (white and amber primaries are mixed) . 15

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SIST EN 4731:2018
EN 4731:2018 (E)
European foreword
This document (EN 4731:2018) has been prepared by the Aerospace and Defence Industries
Association of Europe - Standardization (ASD-STAN).
After enquiries and votes carried out in accordance with the rules of this Association, this Standard has
received the approval of the National Associations and the Official Services of the member countries of
ASD, prior to its presentation to CEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by November 2018, and conflicting national standards
shall be withdrawn at the latest by November 2018.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
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SIST EN 4731:2018
EN 4731:2018 (E)
Introduction
Photoluminescent marking systems are commonly used in passenger airplanes to provide visual
guidance in emergency events. Those marking systems need to be charged by ambient light during
cabin preparation and/ or aircraft operation as to be operational if, at any phase of a flight, an
emergency occurs.
While the certification regulations require photoluminescent marking system to be sufficiently charged
solely by cabin interior lighting, i.e. without accounting for daylight entering the cabin through
windows, only certain portions of the visual light spectrum emitted by a cabin interior luminaire are
stored by the photoluminescent pigment and thus contribute to charging.

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SIST EN 4731:2018
EN 4731:2018 (E)
1 Scope
This document defines a measure for the spectral quality of LED luminaires in terms of the ratio of the
amount of visual light emitted by the luminaire versus the amount effective for charging
photoluminescent products contained in that spectrum.
Fulfilment of this document by a LED luminaire will ensure general compatibility of the luminaire with
photoluminescent marking systems.
This document alone does not provide any means of compliance to fulfil any airworthiness
requirements.
For a specific aircraft installation, the spectral power distribution and illuminance at the
photoluminescent marking systems are relevant.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 4706, Aerospace series — LED colour and brightness ranking
CIE 018.2:1983, The basis of physical photometry
3 Terms, definitions and abbreviations
For the purposes of this document, the following terms, definitions and abbreviations apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
Light Emitting Diode
LED
solid state device embodying a p-n junction, emitting optical radiation when excited by an electric
current
3.2
single colour LED luminaire
luminaire using one or more LEDs as source of light whereas the luminaire is designed to operate in a
single colour mode only
3.3
multiple colour LED luminaire
luminaire using two or more LEDs as source of light whereas the LEDs are of at least two different
primary wavelengths and the luminaire is designed to operate in two or more colour modes by
controlling the light output of the different primaries independently
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SIST EN 4731:2018
EN 4731:2018 (E)
3.4
spectral irradiance
Eλ(λ)
function that relates the spectral irradiance Eλ of a light source to the wavelength λ
Note 1 to entry: The function’s unit is [W/m²/nm].
3.5
photopic luminosity function
V(λ)
function that relates the average spectral sensitivity of human visual perception of brightness at
photopic light levels to the wav
...