SIST EN 4706:2019

SLOVENSKI STANDARD
SIST EN 4706:2019
01-september-2019
Aeronavtika - LED barvna razvrstitev in svetlost
Aerospace series - LED colour and brightness ranking
Luft- und Raumfahrt - LED Farb- und Helligkeitsklassifizierung
Série aérospatiale - Classement de couleur et brillance des LED
Ta slovenski standard je istoveten z: EN 4706:2019
ICS:
17.180.20 Barve in merjenje svetlobe Colours and measurement of
light
49.095 Oprema za potnike in Passenger and cabin
oprema kabin equipment
SIST EN 4706:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 4706:2019

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SIST EN 4706:2019


EN 4706
EUROPEAN STANDARD

NORME EUROPÉENNE

June 2019
EUROPÄISCHE NORM
ICS 29.140.99; 49.095
English Version

Aerospace series - LED colour and brightness ranking
Série aérospatiale - Classement de couleur et brillance Luft- und Raumfahrt - LED Farb- und
des LED Helligkeitsklassifizierung
This European Standard was approved by CEN on 6 August 2018.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, 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
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4706:2019 E
worldwide for CEN national Members.

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SIST EN 4706:2019
EN 4706:2019 (E)
Contents
Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Chromaticity classification . 8
4.1 Chromaticity loci coordinates of white LEDs . 8
4.2 Colour tolerances of monochromatic LEDs . 8
4.3 Chromaticity coordinate distance . 9
5 Brightness classification . 11
6 Colour rendering classification. 12
Annex A (normative) Chromaticity loci s of the standardized chromaticities . 13
A.1 Standardized chromaticity S 6500 . 14
A.2 Standardized chromaticity S 5700 . 15
A.3 Standardized chromaticity S 5000 . 16
A.4 Standardized chromaticity S 4500 . 17
A.5 Standardized chromaticity S 4000 . 18
A.6 Standardized chromaticity S 3500 . 19
A.7 Standardized chromaticity S 3000 . 20
A.8 Standardized chromaticity S 2700 . 21
Annex B (informative) Standard evolution form . 22
Bibliography . 23

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SIST EN 4706:2019
EN 4706:2019 (E)
European foreword
This document (EN 4706:2019) 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 December 2019, and conflicting national standards shall
be withdrawn at the latest by December 2019.
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 organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom.

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SIST EN 4706:2019
EN 4706:2019 (E)
Introduction
The chromaticity coordinates and brightness of LEDs of the same type have variations caused by the
manufacturing process; this applies to white LEDs and coloured (monochrome) LEDs. Therefore LEDs
have to be selected by the manufacturer into “Colour ranks”. Also the brightness of LEDs has certain
variations, therefore the LEDs are also selected into “Brightness ranks”.
The step width of these ranking systems depends on the manufacturer and the LED type. For certain
applications, e.g. inside an aircraft cabin, a high quality light is demanded, so a manufacturer independent
standardization is desirable.
The purpose of this standard is to provide a simple classification system to enable the end user to define
lighting colour accuracy.
The decimal sign in this document is a comma.
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SIST EN 4706:2019
EN 4706:2019 (E)
1 Scope
This document defines selection ranks for LED Luminaires, and LEDs including OLEDs for the use in
aircraft lighting. The size of these ranks is defined by the use of grades. This European Standard is valid
for photopic light levels only.
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.
IEC 60050-845:1987, International electrotechnical vocabulary — Chapter 845: Lighting
1)
CIE 013.3:1995, Method of measuring and specifying colour rendering properties of light sources
2)
D. L. MacAdam, Specification of small chromaticity differences
3 Terms and definitions
For the purposes of this standard, the following terms and definitions 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
Organic Light Emitting Diode
OLED
organic solid state device embodying a p-n junction, emitting optical radiation when excited by an electric
current
3.3
colour space
description model to define colours in a two-dimensional (colour without intensity, e.g. xy space
CIE 1931) or three-dimensional space, (colour and intensity, e.g. Yxy CIE 1931)

1) Published by International Commission on Illumination (CIE), Kegelgasse 27, A-1030 Vienna, Austria.
2) Published in the Journal of the Optical Society of America, vol 32, No. 5, May 1942, pp 247-274, and
in vol 1, No. 1, Jan. 1943, pp 18-26.
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SIST EN 4706:2019
EN 4706:2019 (E)
3.4
LED luminaire
device based on LEDs as light source including optics, electronics and cooling equipment enclosed in a
housing
3.5
CIE 1931 colour space
description of a two-dimensional colour space for light colours
Note 1 to entry: In the CIE 1931 diagram the chromaticity coordinates x and y describe the chromaticity locus in
the diagram. For this standard the CIE 1931 2° observer is applicable.
Note 2 to entry: CIE 015 provides more information about the CIE 1931 colour space.
3.6
chromaticity coordinate
two-dimensional data representation of the colour in the corresponding colour space, e.g. x and y for the
CIE 1931
3.7
MacAdam ellipses
area in the corresponding colour space (e.g. CIE 1931) in which all colours have the same visual
impression to an observer as the colour in the centre of this area
Note 1 to entry: The borderline of the ellipse represents the just noticeable colour difference. Based on
experimental data, originally 25 MacAdam ellipses were defined in the CIE 1931 colour space. In the experiment an
observer had a given colour and was able to modify the chromaticity locus of a second colour. The chromaticity loci,
where the observer determined a difference between the two colours were recorded. When all these points were
plotted in the CIE 1931 diagram, they created an ellipse around the chromaticity locus of the given colour. The size
and the orientation of the ellipses are different for different colours.
[SOURCE: D. L. MacAdam]
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