Aerospace series - Thermal drift of LED luminaires - Classification and measuring methods

This document defines terms, measuring methods and setting(s) for the classification of the thermal behaviour of LED and OLED luminaires in the aircraft cabin regarding chromaticity and luminance. This document is intended for luminaires that are designed to provide photopic vison.

Luft- und Raumfahrt - Thermische Drift von LED Leuchten - Klassifizierung und Messmethoden

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 chromaticité et de luminance. Ce document est destiné aux luminaires qui sont conçus pour délivrer une vision photopique.

Aeronavtika - Toplotni premik LED-svetilk - Razvrstitev in merilne metode

General Information

Status
Not Published
Public Enquiry End Date
23-Jun-2021
Technical Committee
Current Stage
5020 - Formal vote (FV) (Adopted Project)
Start Date
01-Jun-2022
Due Date
20-Jul-2022

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SLOVENSKI STANDARD
oSIST prEN 4828:2021
01-junij-2021
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: prEN 4828
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
oSIST prEN 4828:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 4828:2021
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oSIST prEN 4828:2021
DRAFT
EUROPEAN STANDARD
prEN 4828
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2021
ICS 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 draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ASD-

STAN.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 4828:2021 E

worldwide for CEN national Members.
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oSIST prEN 4828:2021
prEN 4828:2021 (E)
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 colour coordinates .................................................................................................................... 7

5 Classification categories ............................................................................................................................... 8

5.1 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 ................................................................................................................................................................. 17

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oSIST prEN 4828:2021
prEN 4828:2021 (E)
European foreword

This document (prEN 4828:2021) 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-STAN, prior to its presentation to CEN.
This document is currently submitted to the CEN Enquiry.
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oSIST prEN 4828:2021
prEN 4828:2021 (E)
Introduction

Colour and light output of a LED lighting device are influenced by its own and environmental

temperature. Variations in temperature can result in variations of light output and chromaticity which

in turn can negatively influence the quality of illumination. Especially when using LED operated light

units, there can be clearly visible differences in chromaticity and luminance of adjacent fixtures as LEDs

are very susceptible to thermal changes.

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 luminance 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.

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oSIST prEN 4828:2021
prEN 4828:2021 (E)
1 Scope

This document defines terms, measuring methods and setting(s) for the classification of the thermal

behaviour of LED and OLED luminaires in the aircraft cabin regarding chromaticity and luminance. 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:

• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
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, definition 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, definition 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, definition 3.3]
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oSIST prEN 4828:2021
prEN 4828:2021 (E)
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, definition 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, definition 3.1 modified]
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, definition 3.2]
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oSIST prEN 4828:2021
prEN 4828:2021 (E)
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 non-linear, dependent on the selected colour space.

Therefore distances are limited to less than 10
...

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