ISO/TS 5733:2024

Technical
Specification
ISO/TS 5733
First edition
Plastics — Test method of exposure
2024-09
to white LED lamps
Plastiques — Méthode d'essai d'exposition aux lampes à LED
blanches
Reference number
© ISO 2024
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ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 1
5.1 Light source .1
5.1.1 General .1
5.1.2 Spectral irradiance .2
5.1.3 Illuminance uniformity .2
5.2 Test chamber .2
5.3 Integrated illuminance meter .3
5.4 Black-panel thermometer .3
5.5 Humidity .3
5.6 Specimen holders .3
5.7 Apparatus to assess changes in properties .3
6 Test specimens . 3
7 Exposure conditions . 3
8 Procedure . 3
8.1 General .3
8.2 Mounting of test specimens .3
8.3 Exposure .4
8.4 Measurement of illuminance exposure .4
8.5 Determination of changes in properties after exposure.4
9 Test report . 4
Annex A (informative) Example of exposure test results . 5
Bibliography .11

iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
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This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 6, Ageing,
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iv
Introduction
Fluorescent lamps and incandescent lamps have long been used in homes, offices, retail outlets, factory
and commercial facilities. Recently, these facilities have begun changing to white LED (Light Emitting
Diode) lamps. White LED lamps are now in wide use. White LED lamps emit no UV radiation, but can
cause degradation of some materials. This effect is reported in “Study on conservation aspects using LED
[7]
technology for museum lighting” and “Study of the light stability of colour photographic reflection prints
[8]
under LED lighting” . Coloured and uncoloured plastics are used in many places, such as homes, offices
and factories. Different plastics can experience different degradation when exposed to white LED lamps as
compared to when exposed to fluorescent and incandescent lamps. Therefore, a test method to estimate
a product life under white LED lamp is important. This document provides such a test method and also
provides some information about the result between this test method and a test method using a xenon-arc
lamp (see Annex A).
v
Technical Specification ISO/TS 5733:2024(en)
Plastics — Test method of exposure to white LED lamps
1 Scope
This document specifies a method for exposing test specimens to white light emitting diode (LED) lamps at
specified temperatures and relative humidity.
This document is applicable to coloured and uncoloured plastics that are exposed to white LED lamps in indoor
environments such as homes, offices, retail outlets, factory and commercial facilities that do not experience
solar radiation through window glass. It can be applicable to plastics in other environments as well.
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.
ISO 4892-1, Plastics — Methods of exposure to laboratory light sources — Part 1: General guidance and
requirements
ISO 4892-2, Plastics — Methods of exposure to laboratory light sources — Part 2: Xenon-arc lamps
CIE 13.3, Method of measuring and specifying colour rendering properties of light sources
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4892-1 apply.
ISO and IEC maintain terminology 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/
4 Principle
Specimens to be tested are exposed to white LED lamps under controlled conditions. White LED lamps shall
emit only visible radiation, excluding ultraviolet radiation. Test conditions of temperature and humidity
shall be selected to simulate home or office environments.
5 Apparatus
5.1 Light source
5.1.1 General
The light source shall comprise one or more white LED lamps. Typically, a white LED lamp is used, which is a
blue LED chip with phosphors. The following characteristics of the white LED lamps used shall be reported:
— correlated colour temperature, CCT;
— average colour rendering index, R , according to CIE 13.3;
a
— the manufacturer.
The following additional information should also be reported, if available:
— dominant wavelength of the excitation LED;
— relative spectral irradiance.
NOTE An LED lamp can be an integrated LED lamp (LEDi lamp), or a semi-integrated LED lamp (LEDsi lamp), or a
non-integrated LED lamp (LEDni lamp).
5.1.2 Spectral irradiance
The specification of a typical white LED lamp used in this test method is as follows:
— CCT of 5 000 K ± 250 K;
— R > 80;
a
— Spectral irradiance over the range 300 nm < λ < 400 nm is less than 0,2 % of the total irradiance over the
range 300 nm < λ < 800 nm.
Figure 1 shows an example of relative spectral irradiance of a white LED lamp suitable for this test method.
Key
X wavelength (nm)
Y relative spectral irradiance
Figure 1 — Example of relative spectral irradiance of a white LED lamp suitable for this test method
5.1.3 Illuminance uniformity
NOTE The illuminance is the spectral irradiance multiplied by the spectral luminous efficiency function (spectral
brightness sensitivity of the human eye in daylight).
The illuminance at any position in the area used for specimen exposure shall be at least 90 % of the maximum
illuminance, unless specimen repositioning is performed. Requirements for periodic repositioning of
specimens when this requirement is not met are described in ISO 4892-1.
For some materials that have high reflectivity or high sensitivity to illuminance and temperature, periodic
repositioning of specimens is recommended to ensure uniformity of exposures, even when the illuminance
uniformity in the exposure area is within the limits so that repositioning is not required.
5.2 Tes
...