Perfomance of reflecting surfaces for luminaires

This European standard is applicable to the optical performance of untreated or coated materials supplied in plane sheet or strip form for use as a plane or formed reflector as well as preformed reflectors both as originally produced and after prescribed tests to determine probable maintained performance in service. This includes: a) untreated base materials, including: 1) aluminium, 2) steel, 3) plastic, 4) glass. b) surface treated materials, including: 1) polished materials, 2) anodised materials, 3) vacuum metallised materials, 4) painted materials, 5) multilayer systems. This European Standard is not applicable to fluorescent materials.

Bewertung von Reflektoroberflächen für den Einsatz in Leuchten

Diese Europäische Norm behandelt die optischen Eigenschaften von unbehandelten oder beschichteten Materialien, die in Tafel- oder Rollenware geliefert werden zur Herstellung von glatten oder geformten Reflektoren als auch vorgeformten Reflektoren, die beide sowohl im Originalzustand als auch nach vorgeschriebenen Prüfungen betrachtet werden, um die Eigenschaften im Gebrauch zu bestimmen und beizubehalten. Dies beinhaltet:
-   Unbehandeltes Grundmaterial, einschließlich
-   Aluminium,
-   Stahl,
-   Kunststoff,
-   Glas.
-   Oberflächenbehandelte Materialien, einschließlich
-   Polierte Materialien,
-   Eloxierte Materialien,
-   Im Vakuum metallisierte Materialien,
-   Lackierte Oberflächen,
-   Multilayersysteme.
Fluoreszierende Materialien werden nicht in dieser Norm behandelt.

Performance des surfaces réfléchissantes pour luminaires

La présente norme traite des performances optiques des matériaux non traités ou revêtus, fournis sous forme de plaque plate ou de bande, destinés à être utilisés comme réflecteurs plats ou formés, ainsi que préformés, à la fois de produits tels qu’ils ont été fabriqués au départ et après avoir été soumis aux essais prescrits permettant de déterminer la possibilité de performances à maintenir en service. Cela comprend :
-   les matériaux de base non traités, comprenant :
-   l’aluminium,
-   l’acier,
-   le plastique,
-   le verre,
-   les matériaux traités en surface, comprenant :
-   les matériaux polis,
-   les matériaux anodisés,
-   les matériaux métallisés sous vide,
-   les matériaux peints,
-   les systèmes multicouches.
Les matériaux fluorescents ne relèvent pas du domaine d’application de la présente norme.

Lastnosti odsevnih površin v svetilkah

Ta evropski standard se uporablja za optične lastnosti neobdelanih ali oplaščenih materialov, dobavljenih v obliki ravnih plošč ali trakov za uporabo v obliki plošč ali oblikovanih odsevnikov ter predhodno oblikovanih odsevnikov, v izvirni obliki in po predpisanih preskusih za določanje možnih vzdrževanih lastnosti med delovanjem. To zajema: a) neobdelane osnovne materiale, vključno z: 1) aluminijem, 2) jeklom, 3) plastiko, 4) steklom; b) površinsko obdelane materiale, vključno s: 1) poliranimi materiali, 2) anodnimi materiali, 3) vakuumsko metaliziranimi materiali, 4) barvanimi materiali, 5) večplastnimi sistemi. Ta evropski standard se ne uporablja za fluorescentne materiale.

General Information

Status
Published
Public Enquiry End Date
29-Jun-2011
Publication Date
07-Apr-2013
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
31-Jan-2013
Due Date
07-Apr-2013
Completion Date
08-Apr-2013

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Lastnosti odsevnih površin v svetilkahBewertung von Reflektoroberflächen für den Einsatz in LeuchtenPerformance des surfaces réfléchissantes pour luminairesPerfomance of reflecting surfaces for luminaires91.160.01Razsvetljava na splošnoLighting in generalICS:Ta slovenski standard je istoveten z:EN 16268:2013SIST EN 16268:2013en,fr,de01-maj-2013SIST EN 16268:2013SLOVENSKI

STANDARD
SIST EN 16268:2013
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 16268
January 2013 ICS 29.140.40 English Version
Perfomance of reflecting surfaces for luminaires

Performance des surfaces réfléchissantes pour luminaires Bewertung von Reflektoroberflächen für den Einsatz in Leuchten This European Standard was approved by CEN on 1 December 2012.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 16268:2013: ESIST EN 16268:2013

EN 16268:2013 (E) 2 Contents Page Foreword ....................................................................................................................................................... 3 1 Scope ................................................................................................................................................ 4 2 Normative references ....................................................................................................................... 4 3 Terms and definitions ...................................................................................................................... 5 4 Measurement methods .................................................................................................................... 6 4.1 General ............................................................................................................................................. 6 4.2 Total reflectance=ρtot ......................................................................................................................... 7 4.3 Diffuse reflectance=ρd ....................................................................................................................... 8 4.4 Specular reflectance ρr, ρrL,=ρrT ......................................................................................................... 8 4.5 Colour ............................................................................................................................................... 8 5 Durability test methods for evaluation of reflective materials based on maintained performance under different specified conditions ......................................................................... 8 5.1 General ............................................................................................................................................. 8 5.2 Temperature resistance ................................................................................................................... 9 5.3 Humidity resistance ......................................................................................................................... 9 5.4 UV-Exposure resistance .................................................................................................................. 9 5.5 Abrasion resistance ......................................................................................................................... 9 5.6 Scratch resistance ........................................................................................................................... 9 6 Classification .................................................................................................................................... 9 7 Assignment of Reflectance Class ................................................................................................. 10 8 Presentation of performance data ................................................................................................. 10 Annex A (normative)

Measurement of total, diffuse and specular reflectance and colour ...................... 13 A.1 General ........................................................................................................................................... 13 A.2 Measurement of total reflectance .................................................................................................. 13 A.3 Measurement of diffuse reflectance .............................................................................................. 16 A.4 Measurement of specular reflectance ........................................................................................... 16 Annex B (normative)

Measurement of abrasion and scratch resistance.................................................. 18 B.1 Measurement of abrasion and wipe resistance according to ISO 9211-4:2012 ........................... 18 B.2 Measurement of scratch-resistance according to ISO 15184:2012 .............................................. 18 Annex C (informative)

Further important properties of reflective materials ............................................. 21 C.1 Cleaning.......................................................................................................................................... 21 C.2 Solvent Resistance ........................................................................................................................ 21 Annex D (informative)

Examples of structured surfaces ........................................................................... 22 Bibliography................................................................................................................................................ 24

SIST EN 16268:2013

EN 16268:2013 (E) 3 Foreword This document (EN 16268:2013) has been prepared by Technical Committee CEN/TC 169 “Light and lighting”, the secretariat of which is held by DIN. 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 July 2013, and conflicting national standards shall be withdrawn at the latest by July 2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 16268:2013

EN 16268:2013 (E) 4 1 Scope This European standard is applicable to the optical performance of untreated or coated materials supplied in plane sheet or strip form for use as a plane or formed reflector as well as preformed reflectors both as originally produced and after prescribed tests to determine probable maintained performance in service. This includes:

a) untreated base materials, including: 1) aluminium, 2) steel, 3) plastic, 4) glass. b) surface treated materials, including: 1) polished materials,

2) anodised materials, 3) vacuum metallised materials, 4) painted materials, 5) multilayer systems. This European Standard is not applicable to fluorescent materials. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 12665, Light and lighting — Basic terms and criteria for specifying lighting requirements EN ISO 4892-3:2006, Plastics — Methods of exposure to laboratory light sources — Part 3: Fluorescent UV lamps (ISO 4892-3:2006) EN ISO 6270-2:2005, Paints and varnishes — Determination of resistance to humidity — Part 2: Procedure for exposing test specimens in condensation-water atmospheres (ISO 6270-2:2005) ISO 7668, Anodizing of aluminium and its alloys — Measurement of specular reflectance and specular gloss of anodic oxidation coatings at angles of 20 degrees, 45 degrees, 60 degrees or 85 degrees ISO 9211-4:2012, Optics and photonics — Optical coatings — Part 4: Specific test methods ISO 15184:2012, Paints and varnishes — Determination of film hardness by pencil test CIE 15.3:2004, Colorimetry CIE 130:1998, Practical methods for the measurement of reflectance and transmittance SIST EN 16268:2013

EN 16268:2013 (E) 5 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 12665, CIE 130:1998 and the following apply. 3.1

light reflecting surface of a luminaire all reflecting surfaces of a luminaire with the main task of reflecting light and therefore with a total reflectance of at least 50 % 3.2 reflection process by which radiation is returned by a surface or a medium, without change of frequency of its monochromatic components 3.3 total reflectance

reflectance

=ρtot ratio of the whole reflected luminous flux to the incident flux: ()()()()()∫∫∞∞⋅⋅⋅==00/λλλλλλρλφφρdVSdVSitottot (1) where (λ)

is the total spectral reflectance of the sample; S(λ)

is the relative spectral power distribution of the incident radiation of standard illuminant A;

φtot
is the total luminous flux reflected by the sample; φi
is the total incident luminous flux on the sample, V(λ)

is the relative spectral weighting function of standard Observer at 2°. 3.4 diffuse reflectance==ρd

ratio of the diffuse reflected part of the reflected luminous flux to the incident flux: ()()()()()∫∫∞∞⋅⋅⋅==00/λλλλλλρλφφρdVSdVSdidd (2) where d

is the diffuse spectral reflectance characteristic of the sample; dφ
is the diffuse reflected luminous flux; SIST EN 16268:2013
EN 16268:2013 (E) 6 iφ
is the incident luminous flux; S(λ)

is the relative spectral power distribution of the incident radiation of standard illuminant A; V(λ)

is the relative spectral weighting function of standard Observer at 2°. 3.5 specular reflectance regular reflectance ρr

reflection in accordance with the laws of geometrical optics, without diffusion, expressed as the ratio of the regular reflected part of the reflected luminous flux to the incident luminous flux: ()()()()()∫∫∞∞⋅⋅⋅==00r/λλλλλλρλφφρdVSdVSirr

(3) where r(λ)
is the regular spectral reflectance characteristic of the sample; rφ
is the specular reflected luminous flux; iφ
is the incident luminous flux; S(λ)
is the relative spectral power distribution of the incident radiation; V(λ)

is the relative spectral weighting function of standard Observer at 2°. 3.6 reflectance class performance classification for reflecting materials determined from the total reflectance and expressed as a character from A+ to H indicating decreasing reflectance efficiency

4 Measurement methods
4.1

General The format of samples shall be plane and the minimum dimensions should be 100 mm x 100 mm.

For formed reflectors, a plane sample of the reflector should be taken or a plane sample of the same material should be produced in the same manner as the final reflector.

For materials manufactured by a linear process, measurements shall be made with the plane of incidence both parallel (i. e. longitudinal) to and perpendicular (i. e. transverse) to the linear process direction which shall be marked by the manufacturer on the samples, see Figure 1. The relevant symbols shall be marked by an index "L" for longitudinal direction and by "T" for transverse direction.

SIST EN 16268:2013
EN 16268:2013 (E) 7

Key 1 sample a rolling direction b parallel direction c perpendicular direction Figure 1 — Illustration of measurement parallel and perpendicular to the linear process direction For embossed structured surfaces, the width of the illuminated area on the sample inside the sphere according to Annex A shall be at least three times larger than the dimension of the structure. Depending on the kind of structure, measurements in three or four directions shall be considered. In Annex D, examples of structure are illustrated.

NOTE Due to the undulating surface of embossed materials, good contact between the sample and the rim of the sample port cannot be maintained at all points. The resulting light leakage can cause the results of measurements made on these materials to be lower than their actual total reflectance values.

4.2 Total reflectance=ρtot
The measurement shall be made in accordance with Annex A and documented.

For materials manufactured by a linear process, measurements shall be made with the plane of incidence both parallel to and perpendicular to the linear process direction (see Figure 1). For all other materials measurement shall be done in two perpendicular directions.

Five measurements in each of these directions on different areas of the materials are required.

The mean longitudinal value and the mean transverse value across all samples shall be calculated.

The total reflectance shall be the higher value of the mean values.

The uncertainty of the measurement process shall be documented, stating the percentage of uncertainty and the method by which the value was determined. SIST EN 16268:2013

EN 16268:2013 (E) 8 4.3 Diffuse reflectance=ρd The diffuse reflectance =ρd shall be measured according to Annex A and documented. For materials manufactured by a linear process, measurements shall be made with the plane of incidence both parallel to and perpendicular to the linear process direction (see Figure 1). For all other materials, measurement shall be done in two perpendicular directions.

Five measurements in each of these directions on different areas of the materials are required.

The lowest longitudinal value and the lowest transverse value across all samples shall be recorded.

NOTE For diffuse reflectance measurement, the lowest value is taken in order to avoid errors due to sample distortion causing the specular reflected light to strike the edge of the sphere exit aperture. The diffuse reflection shall be the mean of the two recorded values. 4.4 Specular reflectance ρr, ρrL,=ρrT Measurement shall be made according to Annex A in both longitudinal and transverse directions.

For nonlinear processed materials the measurements should be made in two perpendicular directions.

Five measurements in each of these directions on different areas of the materials are required. The mean longitudinal value ρrL and the mean transverse value ρrT across all samples shall be calculated.

Values of transverse and longitudinal directions shall both be stated.
4.5 Colour

Colour shall be expressed in CIE L*a*b*-system using standard illuminant D65 (Daylight) (see CIE 15.3:2004).

Five measurements at different points of the surface shall be measured and the average values L, a*, b* shall be taken. Measurements made before and after the durability tests shall be made using the same instrument and the same method.

5 Durability test methods for evaluation of reflective materials based on maintained performance under different specified conditions 5.1 General Different reflector materials show different rates of reflectance loss due to the effects of oxidation, humidity, UV exposure and abrasion. The durability tests used in this standard and described below are used to demonstrate within a short time of testing the likely relative deterioration of a reflector material in normal service and give an indication of the maintained performance.

It is the responsibility of the user of the material to perform suitable tests to determine the worst case operating condition (e.g. highest temperature reached on the reflector surface, etc.) within their application.

For each test on a batch of materials, a new sample with equal properties to the others is required. Measurement of reflectance values shall be made according to Clause 4, Annex A and Annex B. All measurements before and after durability tests shall be made with the same instrument under the same measurement conditions.

The same panel shall be measured before and after each exposure.
SIST EN 16268:2013

EN 16268:2013 (E) 9 Films and foils shall be tested on the proposed base material.

5.2 Temperature resistance The test shall be carried out in air at one or more of the following temperatures T: 80 °C, 120 °C, 160 °C, 200 °C, 250 °C, 300 °C, 400 °C.

Temperature level T shall be recorded as shown in Table 2 and Table 3.

Test duration shall be 168 h without interruption. The temperature resistance tests are carried out by placing test panels of the reflecting materials in an oven at the stated temperature. The temperature shall be maintained within +/- 5°C for the duration of the test.

The reflective surface shall not make contact with any other surface during the test.

The physical condition of the material shall be observed after the test and any deterioration shall be recorded (see Table 3).

5.3 Humidity resistance The humidity test shall be carried out in a test cabinet with constant condensation at 40 °C for a duration of 168 h without interruption according to EN ISO 6270-2:2005, Table 1, code CH, using deionised water.

The reflective surface shall not make contact with any other surface during the test.

The physical condition of the material shall be observed after the test and any deterioration shall be recorded (see Table 3).

5.4 UV-Exposure resistance Durability on exposure to UV- radiation shall be tested according to EN ISO 4892-3:2006, Table 4, cycle no. 5 for a duration of 504 h (three weeks).

The reflective surface shall not make contact with any other surface during the test.

The physical condition of the material shall be observed after the test and any deterioration shall be recorded (see Table 3).

5.5 Abrasion resistance Measurements shall be made according to ISO 9211-4:2012 (see Annex B).

The physical condition of the material shall be observed after the test and any deterioration shall be recorded (see Table 3).

5.6 Scratch resistance Measurements shall be made according to ISO 15184:2012 (see Annex B).

The physical condition of the material shall be observed after the test and any deterioration shall be recorded together with the hardness of the pencil causing the deterioration (see Table 3).

6 Classification

The Reflectance Class represents the total reflectance of the surface indicating the potential for energy efficiency of the material when used in a luminaire.

SIST EN 16268:2013

EN 16268:2013 (E) 10 The reflecting surfaces of materials are classified according to Table 1.

Table 1 — Reflectance classes of reflecting surfaces of materials
Reflectance class Total reflectance % A+ 97,0 to 100,0

A 93,0 to 96,9 B 88,0 to 92,9 C 82,0 to 87,9 D 76,0 to 81,9 E 70,0 to 75,9 F 64,0 to 69,9 G 58,0 to 63,9 H 50,0 to 57,9 Depending on luminaire design and geometry, a high diffuse reflectance can have a negative effect on the energy efficiency of a luminaire and this should be taken into account when interpreting Table 1.

7 Assignment of Reflectance Class All reflector materials supplied in accordance with this standard shall be assigned a reflectance class character indicating the initial and the maintained reflectance performance determined from the results of total reflectance measurements before and after durability tests. For the assignment of maintained reflectance class, the following tests shall be made:  temperature resistance according to 5.2;

 humidity resistance according to 5.3;  UV-exposure resistance according to 5.4.

The maintained reflectance class shall be indicated by a letter allocated from Table 1 for each test.

8 Presentation of performance data The manufacturer of the reflector material shall provide a data sheet of the type shown in Table 2 showing the quantitative results of the tests according to Clause 4 and durability tests according to Clause 5.

The manufacturer shall state the following measurement details:  method used and type and manufacturer of measurement instruments;

 calibra
...

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

površine v svetilihBewertung von Reflektoroberflächen für den Einsatz in LeuchtenPerformance des surfaces réfléchissantes pour luminairesPerfomance of reflecting surfaces for luminaires91.160.01Razsvetljava na splošnoLighting in generalICS:Ta slovenski standard je istoveten z:prEN 16268oSIST prEN 16268:2011en,fr,de01-junij-2011oSIST prEN 16268:2011SLOVENSKI

STANDARD
oSIST prEN 16268:2011
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
DRAFT prEN 16268
April 2011 ICS
English Version
Perfomance of reflecting surfaces for luminaires

Performance des surfaces réfléchissantes pour luminaires Bewertung von Reflektoroberflächen für den Einsatz in Leuchten This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 169.

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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland 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
Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. prEN 16268:2011: EoSIST prEN 16268:2011

prEN 16268:2011 (E) 2 Contents Page Foreword ..............................................................................................................................................................41 Scope ......................................................................................................................................................42 Normative references ............................................................................................................................43 Terms and definitions ...........................................................................................................................54 Measurement methods ..........................................................................................................................74.1 General ....................................................................................................................................................74.2 Total reflectance ρtot ...............................................................................................................................84.3 Diffuse reflectance

ρd.............................................................................................................................84.4 Specular reflectance ρr, ρrL, ρrT ..............................................................................................................84.5 Colour .....................................................................................................................................................85 Durability test methods for evaluation of reflective materials based on maintained performance under different specified conditions .............................................................................95.1 General ....................................................................................................................................................95.2 Temperature ...........................................................................................................................................95.3 Humidity ..................................................................................................................................................95.4 UV-Exposure ..........................................................................................................................................95.5 Abrasion .............................................................................................................................................. 105.6 Scratch resistance .............................................................................................................................. 106 Classification ....................................................................................................................................... 107 Presentation of data ........................................................................................................................... 118 Maintained reflectance classes ......................................................................................................... 13Annex A (normative)

Measurement of total, diffuse and specular reflectance and colour ...................... 14A.1 General ................................................................................................................................................. 14A.2 Measurement of total reflectance ...................................................................................................... 14A.2.1 General ................................................................................................................................................. 14A.2.2 Geometry ............................................................................................................................................. 14A.2.3 Illumination .......................................................................................................................................... 15A.2.4 Detection .............................................................................................................................................. 16A.2.5 Calibration samples ............................................................................................................................ 16A.3 Measurement of diffuse reflectance ................................................................................................. 17A.4 Measurement of specular reflectance .............................................................................................. 17A.4.1 General ................................................................................................................................................. 17A.4.2 Principle ............................................................................................................................................... 17Annex B (normative)

Measurement of abrasion and scratch resistance ................................................... 19B.1 Measurement of abrasion and wipe resistance according to ISO 9211-4:2006 ........................... 19B.1.1 General ................................................................................................................................................. 19B.1.2 Cheesecloth ......................................................................................................................................... 19B.1.3 Test conditions ................................................................................................................................... 19B.1.4 Evaluation ............................................................................................................................................ 19B.2 Measurement of scratch-resistance according to ISO 15184:1998 ............................................... 20B.2.1 General ................................................................................................................................................. 20B.2.2 Test instrument ................................................................................................................................... 20B.2.3 Pencils ................................................................................................................................................. 21B.2.4 Test conditions ................................................................................................................................... 22B.2.5 Evaluation ............................................................................................................................................ 22Annex C (informative)

Further important properties of reflective materials .............................................. 23oSIST prEN 16268:2011

prEN 16268:2011 (E) 3 C.1 Cleaning................................................................................................................................................ 23C.2 Solvent Resistance .............................................................................................................................. 23Annex D (informative) Examples of structured surfaces ............................................................................... 24 oSIST prEN 16268:2011

prEN 16268:2011 (E) 4 Foreword This document (prEN 16268:2011) has been prepared by Technical Committee CEN/TC 169 “Light and lighting”, the secretariat of which is held by DIN. This document is currently submitted to the CEN Enquiry. 1 Scope The standard covers the optical performance of untreated or coated materials supplied in plane sheet or strip form for use as a plane or formed reflector as well as preformed reflectors both as originally produced and after prescribed tests to determine probable maintained performance in service. This includes:

 Untreated base material, including

 Aluminium,  Steel,  Plastic,  Glass.  surface treated materials, including:  Polished materials,

 Anodized materials,  Vacuum metallized materials,  Painted materials,  Multilayer systems. Fluorescent materials are not within the scope of this standard.

2 Normative references The following referenced documents are indispensable for the application 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 60695-2-12:2001, Fire hazard testing — Part 2-12: Glowing/hot-wire based test methods — Glow-wire flammability test method for materials (IEC 60695-2-12:2000). EN ISO 4892-1, Plastics — Methods of exposure to laboratory light sources — Part 1: General guidance EN ISO 4892-3, Plastics — Methods of exposure to laboratory light sources — Part 3: Fluorescent UV lamps oSIST prEN 16268:2011

prEN 16268:2011 (E) 5 EN ISO 6270-2:2005, Paints and varnishes — Determination of resistance to humidity — Part 2: Procedure for exposing test specimens in condensation-water atmospheres ISO 7668:2010, Anodizing of aluminium and its alloys — Measurement of specular reflectance and specular gloss of anodic oxidation coatings at angles of 20°, 45°, 60° or 85° ISO 9211-4:2006, Optics and optical instruments — Optical coatings — Part 4: Specific test methods ISO 15184:1998, Paints and varnishes — Determination of film hardness by pencil test ISO/DIS 11925-2, Reaction to fire tests — Ignitability of products subjected to direct impingement of flame — Part 2: Single-flame source test Technical Report CIE 15.3:2004, Colorimetry Technical Report CIE 130:1998, Practical methods for the measurement of reflectance and transmittance. 3 Terms and definitions For the purposes of this document, the terms and definitions given in Technical Report CIE 130:1998 and the following apply. 3.1

light reflecting surface of a luminaire all reflecting surfaces of a luminaire with the main task of reflecting light and therefore with a total reflectance of at least 50 % 3.2 reflection process by which radiation is returned by a surface or a medium, without change of frequency of its monochromatic components. 3.3 total reflectance

reflectance
(de: Gesamtreflexionsgrad)
ρtot ratio of the whole reflected luminous flux to the incident flux,
()()()()()∫∫∞∞⋅⋅⋅==00/λλλλλλρλφφρdVSdVSitottot (1) where (λ)
is the total spectral reflectance of the sample; S(λ)

is the relative spectral power distribution of the incident radiation of standard illuminant A;

φtot
is the total luminous flux reflected by the sample; φi
is the total incident luminous flux on the sample. oSIST prEN 16268:2011
prEN 16268:2011 (E) 6 3.4 diffuse reflectance

ratio of the diffuse reflected part of the reflected luminous flux to the incident flux ()()()()()∫∫∞∞⋅⋅⋅==00/λλλλλλρλφφρdVSdVSdidd (2) where d

is the diffuse spectral reflectance characteristic of the sample; dφ
is the diffuse reflected luminous flux; iφ
is the incident luminous flux; S(λ)

is the relative spectral power distribution of the incident radiation of standard illuminant A; V(λ)

is the relative spectral weighting function of standard Observer at 2°. 3.5 specular reflectance regular reflectance (de: gerichteter Reflexionsgrad) ρr

reflection in accordance with the laws of geometrical optics, without diffusion, expressed as the ratio of the regular reflected part of the reflected luminous flux to the incident luminous flux ()()()()()∫∫∞∞⋅⋅⋅==00r/λλλλλλρλφφρdVSdVSirr

(3) where rφ
is the specular reflected luminous flux; iφ
is the incident luminous flux; r(λ)
is the relevant spectral characteristic of the sample; S(λ)
is the relative spectral power distribution of the incident radiation; V(λ)

is the relative spectral weighting function of standard Observer at 2°. oSIST prEN 16268:2011

prEN 16268:2011 (E) 7 4 Measurement methods
4.1

General The format of sample shall be plane and the minimum dimensions should be 100 mm *100 mm.

For formed reflectors, a plane sample of the reflector should be taken or a plane sample with the same material should be produced in the same manner as the final reflector.

For materials manufactured by a linear process measurements shall be made with the plane of incidence both parallel (i. e. longitudinal) to and perpendicular (i. e. transverse) to the linear process direction which shall be marked by the manufacturer on the samples, see figure 1. The relevant symbols shall be marked by an index "L" for longitudinal direction and by "T" for transverse direction.

Key 1 sample a rolling direction b parallel direction c perpendicul direction Figure 1 — Measurement parallel and perpendicular with the linear process direction For embossed structured surfaces the width of the illuminated area on the sample inside the sphere according to annex A shall be at least three times larger than the dimension of the structure. Depending on the kind of structure measurements in three or four directions shall be considered. In annex D examples of structure are illustrated.

NOTE Due to the undulating surface of embossed materials good contact between the sample and the rim of the sample port cannot be maintained at all points. The resulting light leakage can cause the results of measurements made on these materials to be lower than their actual total reflectance values.

oSIST prEN 16268:2011
prEN 16268:2011 (E) 8 4.2 Total reflectance ρtot
The measurement shall be made in accordance with Annex A and documented.

For materials manufactured by a linear process measurements shall be made with the plane of incidence both parallel to and perpendicular to the linear process direction (see Figure 1). For all other materials measurement shall be done in two perpendicular directions.

Five measurements in each of these directions on different areas of the materials are required.

The mean longitudinal value and the mean transverse value across all samples shall be calculated.

The total reflectance shall be the higher value of the mean values.

The uncertainty of the measurement process shall be documented, stating the percentage of uncertainty and the method by which the value was determined. 4.3 Diffuse reflectance

ρd The diffuse reflectance

ρd shall be measured according to Annex A and documented. For materials manufactured by a linear process measurements shall be made with the plane of incidence both parallel to and perpendicular to the linear process direction (see Figure 1). For all other materials measurement shall be done in two perpendicular directions.

Five measurements in each of these directions on different areas of the materials are required.

The lowest longitudinal value and the lowest transverse value across all samples shall be recorded.

NOTE For diffuse reflectance measurement, the lowest value is taken in order to avoid errors due to sample distortion causing the specular reflected light to strike the edge of the sphere exit aperture.

The diffuse reflection shall be the mean of the two recorded values. 4.4 Specular reflectance ρr, ρrL, ρrT Measurement shall be made according to Annex A in both longitudinal and transverse directions.

NOTE For nonlinear processed materials the measurements should be made in two perpendicular directions.

Five measurements in each of these directions on different areas of the materials are required.

The mean longitudinal value ρrL and the mean transverse value ρrT across all samples shall be calculated.

Values of transverse and longitudinal directions shall both be stated.
4.5 Colour

If colour is measured, it shall be expressed in CIE L*a*b*-system using standard illuminant D65 (Daylight) (see CIE 15.3:2004).

Five measurements at different points of the surface shall be measured and the average values L, a*, b* shall be taken. Measurements made before and after a colour change shall be made using the same instrument and the same methods.

oSIST prEN 16268:2011

prEN 16268:2011 (E) 9 5 Durability test methods for evaluation of reflective materials based on maintained performance under different specified conditions 5.1 General It is the responsibility of the user of the material to perform suitable tests to determine the worst case operating condition (e. g. highest temperature reached on the reflector surface, etc.) within their application.

For each test on a batch of materials a new sample with equal properties to the others is required. Measurement of reflectance values shall be done according to clause 4, Annex A and Annex B. All measurements before and after durability tests shall be made with the same instrument under the same measurement conditions.

The same panel shall be measured before and after each exposure.
Films and foils shall be tested on the proposed base material.

5.2 Temperature The test shall be carried out in air at one or more of the following temperatures T: 80 °C, 120 °C, 160 °C, 200 °C, 250 °C, 300 °C, 400 °C.

Temperature level T shall be recorded as shown in table 2.

Test duration shall be 168 hours without interruption. The temperature resistance tests are carried out by placing test panels of the reflecting materials in an oven at the stated temperature. The temperature shall be maintained within +/- 5°C for the duration of the test.

The reflective surface shall not make contact with any other surface during the test.

The physical conditon of the material shall be observed after the test and any deterioration shall be recorded (see table 3).

5.3 Humidity The humidity test shall be carried out in a test cabinet with constant condensation at 40 °C for a duration of 168 h without interruption according to EN ISO 6270-2:2005, table 1, code CH, using deionized water.

The reflective surface shall not make contact with any other surface during the test.

The physical conditon of the material shall be observed after the test and any deterioration shall be recorded (see table 3).

5.4 UV-Exposure Durability on exposure to UV- radiation shall be tested according to EN ISO 4892 -3:2006, table 4, cycle no. 5 for a duration of 504 h (3 weeks).

The reflective surface shall not make contact with any other surface during the test.

The physical conditon of the material shall be observed after the test and any deterioration shall be recorded (see table 3).

oSIST prEN 16268:2011

prEN 16268:2011 (E) 10 5.5 Abrasion Measurements shall be made according to ISO 9211-4:2006 (see Annex B).

The physical conditon of the material shall be observed after the test and any deterioration shall be recorded (see table 3).

5.6 Scratch resistance Measurements shall be made according to ISO 15184:1998 (see Annex B).

The physical conditon of the material shall be observed after the test and any deterioration shall be recorded (see table 3).

6 Classification

The reflectance class represents the total reflectance of the surface indicating the potential for energy efficiency of the material when used in a luminaire.

The reflecting surfaces of materials are classified according to table 1.
oSIST prEN 16268:2011

prEN 16268:2011 (E) 11 Table 1 — Reflectance classes of reflecting surfaces of materials

Reflectance class Total reflectance % A+ 97,0 – 100,0

A 93,0 – 96,9 B 88,0 – 92,9 C 82,0 – 87,9 D 76,0 – 81,9 E 70,0 – 75,9 F 64,0 – 69,9 G 58,0 – 63,9 H 50,0 – 57,9

NOTE Depending on luminaire
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