ISO 22578-2:2024

International
Standard
ISO 22578-2
First edition
Graphical symbols — Safety colours
2024-02
and safety signs —
Part 2:
Measurement of photopic
luminance of phosphorescent
components used in a natural
disaster safety way guidance system
Reference number
© ISO 2024
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Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test specification . 1
4.1 Test specimens.1
4.2 Conditioning.2
4.3 Ambient conditions.2
4.4 Irradiance, illuminance and luminance instrumentation .2
4.4.1 Irradiance instrumentation .2
4.4.2 Illuminance instrumentation .2
4.4.3 Luminance instrumentation .3
4.5 Excitation light conditions .3
4.6 Luminance measurements . .3
4.6.1 General .3
4.6.2 Telephotometer method.3
4.6.3 Contact method .3
4.6.4 Luminance recordings .4
4.7 Test report .4
4.8 Marking of phosphorescent materials .5
Bibliography . 6

iii
Foreword
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This document was prepared by Technical Committee ISO/TC 145, Graphical symbols, Subcommittee SC 2,
Safety identification, signs, shapes, symbols and colours.
A list of all parts in the ISO 22578 series can be found on the ISO website.
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iv
International Standard ISO 22578-2:2024(en)
Graphical symbols — Safety colours and safety signs —
Part 2:
Measurement of photopic luminance of phosphorescent
components used in a natural disaster safety way guidance
system
1 Scope
This document specifies the laboratory test method for the measurement of photopic luminance of
phosphorescent materials classified in accordance with ISO 22578.
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 16069, Graphical symbols — Safety signs — Safety way guidance systems (SWGS)
ISO/CIE 19476, Characterization of the performance of illuminance meters and luminance meters
ISO 22578:2022, Graphical symbols — Safety colours and safety signs — Part 2: Measurement of photopic
luminance of phosphorescent components used in a natural disaster safety way guidance system
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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/
3.1
phosphorescent material
material incorporating phosphors that, if excited by UV or visible radiation, store energy, which is emitted
as light over a period of time
Note 1 to entry: A phosphorescent sign is the same as “photoluminescent”, commonly used in the literature of the
photoluminescent safety sign industry.
[SOURCE: ISO 16069:2017, 3.15]
4 Test specification
4.1 Test specimens
Three specimens shall be tested. Each test specimen shall have an area of phosphorescent material at least
35 mm in diameter, sufficient for the proper operation of the luminance meter used.
...