1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 16268:2013Perfomance of reflectingsurfaces for luminairesBS EN 16268:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 16268:2013.T
2、he UK participation in its preparation was entrusted to TechnicalCommittee EL/1, Light and lighting applications.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Us
3、ers are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 74542 3ICS 29.140.40Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of
4、theStandards Policy and Strategy Committee on 31 January 2013.Amendments issued since publicationDate Text affectedBS EN 16268:2013EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 16268 January 2013 ICS 29.140.40 English Version Perfomance of reflecting surfaces for luminaires Performance des su
5、rfaces rflchissantes pour luminaires Bewertung von Reflektoroberflchen fr 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
6、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, Fr
7、ench, 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, Bulgari
8、a, 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, Turke
9、y and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR 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 16
10、268:2013: EBS EN 16268:2013EN 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 tot. 7 4.3 Diffuse reflectance d. 8 4.4 Specular reflectance r, rL, rT. 8 4.5 Colour . 8 5 Durability
11、 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 Classificatio
12、n 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 r
13、eflectance . 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 reflectiv
14、e materials . 21 C.1 Cleaning 21 C.2 Solvent Resistance 21 Annex D (informative) Examples of structured surfaces . 22 Bibliography 24 BS EN 16268:2013EN 16268:2013 (E) 3 Foreword This document (EN 16268:2013) has been prepared by Technical Committee CEN/TC 169 “Light and lighting”, the secretariat o
15、f 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 possi
16、bility 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 ar
17、e 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, Po
18、rtugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 16268:2013EN 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 for
19、med 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:
20、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 docume
21、nt 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
22、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)
23、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, Paint
24、s 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 BS EN 16268:2013EN 16268:2013 (E) 5 3 Terms and definitions For the purposes of this document, the terms and definitions given
25、 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
26、a medium, without change of frequency of its monochromatic components 3.3 total reflectance reflectance tot ratio of the whole reflected luminous flux to the incident flux: ( ) ( ) ( )( ) ( )=00/dVSdVSitottot (1) where () is the total spectral reflectance of the sample; S() is the relative spectral
27、power distribution of the incident radiation of standard illuminant A; totis the total luminous flux reflected by the sample; i is the total incident luminous flux on the sample, V() is the relative spectral weighting function of standard Observer at 2. 3.4 diffuse reflectance d ratio of the diffuse
28、 reflected part of the reflected luminous flux to the incident flux: ( ) ( ) ( )( ) ( )=00/dVSdVSdidd(2) where dis the diffuse spectral reflectance characteristic of the sample; d is the diffuse reflected luminous flux; BS EN 16268:2013EN 16268:2013 (E) 6 i is the incident luminous flux; S() is the
29、relative spectral power distribution of the incident radiation of standard illuminant A; V() is the relative spectral weighting function of standard Observer at 2. 3.5 specular reflectance regular reflectance r reflection in accordance with the laws of geometrical optics, without diffusion, expresse
30、d as the ratio of the regular reflected part of the reflected luminous flux to the incident luminous flux: ( ) ( ) ( )( ) ( )=00r/dVSdVSirr(3) where r() is the regular spectral reflectance characteristic of the sample; r is the specular reflected luminous flux; i is the incident luminous flux; S() i
31、s the relative spectral power distribution of the incident radiation; V() 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 i
32、ndicating 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
33、 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
34、samples, see Figure 1. The relevant symbols shall be marked by an index “L“ for longitudinal direction and by “T“ for transverse direction. BS EN 16268:2013EN 16268:2013 (E) 7 Key 1 sample a rolling direction b parallel direction c perpendicular direction Figure 1 Illustration of measurement paralle
35、l 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 t
36、hree 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 resul
37、ts of measurements made on these materials to be lower than their actual total reflectance values. 4.2 Total reflectance tot 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
38、 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 m
39、ean 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. BS EN 16268:2013EN
40、16268:2013 (E) 8 4.3 Diffuse reflectance dThe diffuse reflectance dshall 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 Fig
41、ure 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 dif
42、fuse 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 r, rL, rTMeasur
43、ement 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 longitu
44、dinal value rLand the mean transverse value rTacross 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 di
45、fferent 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 p
46、erformance 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 shor
47、t 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
48、 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 durabi
49、lity tests shall be made with the same instrument under the same measurement conditions. The same panel shall be measured before and after each exposure. BS EN 16268:2013EN 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
