SIST EN 4828:2023
(Main)Aerospace series - Thermal drift of LED luminaires - Classification and measuring methods
Aerospace series - Thermal drift of LED luminaires - Classification and measuring methods
This document defines terms and specifies measuring methods and settings for the classification of the thermal behaviour of LED and OLED luminaires in the aircraft cabin regarding chromaticity and brightness characteristics. This document is intended for luminaires that are designed to provide photopic vison.
Luft- und Raumfahrt - Thermische Drift von LED Leuchten - Klassifizierung und Messmethoden
(No Scope Available)
Série aérospatiale - Dérive thermique des luminaires à LED - Classification et méthodes de mesure
Le présent document définit les termes, et spécifie les méthodes et paramètres de mesure pour la classification du comportement thermique des luminaires à LED et OLED de la cabine d’aéronef en matière de caractéristiques de chromaticité et de brillance. Ce document est destiné aux luminaires qui sont conçus pour délivrer une vision photopique.
Aeronavtika - Toplotni premik LED-svetilk - Razvrstitev in merilne metode
Ta dokument določa terminologijo, merilne metode in nastavitve za razvrstitev toplotnega obnašanja LED- in OLED-svetilk v letalski kabini v zvezi z barvnostjo in svetilnostjo. Namenjen je za svetilke, ki zagotavljajo fotopično vidnost.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-februar-2023
Aeronavtika - Toplotni premik LED-svetilk - Razvrstitev in merilne metode
Aerospace series - Thermal drift of LED luminaires - Classification and measuring
methods
Luft- und Raumfahrt - Thermische Drift von LED Leuchten - Klassifizierung und
Messmethoden
Série aérospatiale - Dérive thermique des luminaires à LED - Classification et méthodes
de mesure
Ta slovenski standard je istoveten z: EN 4828:2022
ICS:
29.140.99 Drugi standardi v zvezi z Other standards related to
žarnicami lamps
49.095 Oprema za potnike in Passenger and cabin
oprema kabin equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 4828
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2022
EUROPÄISCHE NORM
ICS 17.180.20; 29.140.99; 49.095
English Version
Aerospace series - Thermal drift of LED luminaires -
Classification and measuring methods
Série aérospatiale - Dérive thermique des luminaires à Luft- und Raumfahrt - Thermische Drift von LED
LED - Classification et méthodes de mesure Leuchten - Klassifizierung und Messmethoden
This European Standard was approved by CEN on 22 August 2022.
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, Türkiye 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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4828:2022 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Classification references . 7
4.1 General. 7
4.2 Reference temperature . 7
4.3 Reference chromaticity coordinates . 8
5 Classification categories . 8
5.1 Luminous flux classification . 8
5.2 Chromaticity classification . 9
6 Labelling of the luminaire. 9
7 Operating the light unit . 10
7.1 General. 10
7.2 Installation orientation . 10
7.3 Temperature settings . 11
7.4 Power supply . 11
8 Light measurement . 11
8.1 General. 11
8.2 Measurement method . 11
8.3 Measurement devices . 11
8.4 Determination of the start value . 12
Annex A (normative) MacAdam ellipses and interpolation . 13
A.1 General. 13
A.2 Example . 14
Bibliography . 18
European foreword
This document (EN 4828:2022) 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 document has
received the approval of the National Associations and the Official Services of the member countries of
ASD-STAN, 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 May 2023, and conflicting national standards shall be
withdrawn at the latest by May 2023.
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.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
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, Republic of North Macedonia, France, Germany,
Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United
Kingdom.
Introduction
Since LEDs are very susceptible to thermal changes, the chromaticity and luminous flux of an LED
luminaire are affected by both its own and its ambient temperature. Variations in temperature can result
in variations of luminous flux and chromaticity that in turn can negatively influence the quality of
illumination. An example of this is visible differences in chromaticity and luminance of adjacent
luminaires.
These differences depend on the utilized LED types and can be compensated to a certain extent by
electronic means within the device.
By introducing a measurement method, the functional link between temperature variation and thermal
drift of chromaticity and luminous flux in aircraft applications can be quantified. The aim of this method
is to ensure a homogenous appearance of LED light units by considering thermal effects.
1 Scope
This document defines terms and specifies measuring methods and settings for the classification of the
thermal behaviour of LED and OLED luminaires in the aircraft cabin regarding chromaticity and
brightness characteristics. This document is intended for luminaires that are designed to provide
photopic vison.
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 13032-4, Light and lighting — Measurement and presentation of photometric data of lamps and
luminaires — Part 4: LED lamps, modules and luminaires
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
ISO Online browsing platform: available at https://www.iso.org/obp/
IEC Electropedia: available at https://www.electropedia.org/
3.1
chromaticity
colour valences that only differ in luminance
3.2
chromaticity coordinate
two-dimensional data representation of the colour in the corresponding colour space, e.g. x and y for the
CIE 1931
[SOURCE: EN 4706:2019, 3.6]
3.3
CIE 1931 colour space
description of a two-dimensional colour space for light colours
Note 1 to entry: In the CIE 1931 diagram the colour coordinates x and y describe the chromaticity locus in the
diagram. For this document the CIE 1931 2° observer is applicable.
Note 2 to entry: CIE 015 provides more information about the CIE 1931 colour space.
[SOURCE: EN 4706:2019, 3.5]
3.4
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)
[SOURCE: EN 4706:2019, 3.3]
3.5
illuminance
measure of the total luminous flux incident on a surface, per unit area
Note 1 to entry: The unit is lx.
3.6
LED luminaire
device based on LEDs as light source including optics, electronics and cooling equipment enclosed in a
housing
[SOURCE: EN 4706:2019, 3.4]
3.7
light emitting diode
LED
solid state device embodying a p-n junction, emitting optical radiation when excited by an electric current
Note 1 to entry: The term LED in the following context includes organic LED (OLED).
[SOURCE: EN 4706:2019, 3.1 modified — Note 1 to entry has been added.]
3.8
MacAdam ellipse
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: MacAdam, D.L.]
3.9
organic light emitting diode
OLED
organic solid state device embodying a p-n junction, emitting optical radiation when excited by an electric
current
[SOURCE: EN 4706:2019, 3.2]
3.10
standard deviation of colour matching
SDCM
metric of the difference between chromaticities at photopic light level, that describes approximately the
perceptual distance between two chromaticity loci as a multiple of the MacAdam ellipses for these
chromaticity loci
Note 1 to entry: n SDCM means that the distance between the two chromaticity loci is n-times the radius of the
appropriate MacAdam ellipse in that direction. The centre of the ellipse is given by the chromaticity locus of the
reference colour. Two chromaticity loci on opposite points of the MacAdam ellipse have a distance of (2 n) SDCM.
The SDCM calculation between two chromaticity loci may be nonlinear, dependent on the selected colour space.
Therefore distances are limited to less than 10 SDCM.
Note 2 to entry: For this document the calculated data from the MacAdam ellipses has been used.
[SOURCE: EN 4706:2019, 3.8 modified — “light colours” has been replaced by “chromaticities” in the
definition text.]
3.11
thermal drift
variation in chromaticity and luminous flux due to altering temperature
4 Classification references
4.1 General
The luminous flux an
...
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