1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationMethod of measurement of centre beam intensity and beamangle(s) of reflector lampsBS EN 61341:2011National forewordThis Published Document is the UK implementation of EN 61341:20
2、11. It is identical to IEC/TR 61341:2010. It supersedes PD IEC/TR 61341:2010, which is withdrawn.The UK participation in its preparation was entrusted by Technical Committee CPL/34, Lamps and Related Equipment, to Subcommittee CPL/ 34/1, Electric lamps.A list of organizations represented on this com
3、mittee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. BSI 2011ISBN 978 0 580 74261 3 ICS 29.140.20Compliance with a British Standard cannot confer immunity from le
4、gal obligations.This Published Document was published under the authority of the Standards Policy and Strategy Committee on 31 March 2010.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 61341:2011This corrigendum renumbers PD IEC/TR 61341:2010 as BS EN 61341:201
5、131 August 2011EUROPEAN STANDARD EN 61341 NORME EUROPENNE EUROPISCHE NORM July 2011 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels
6、2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61341:2011 E ICS 29.140.20 English version Method of measurement of centre beam intensity and beam angle(s) of reflector lamps (IEC/TR 61341:2010) Mthode de mesure de lintensit
7、dans laxe du faisceau et de langle (ou des angles) douverture des lampes rflecteur (CEI/TR 61341:2010) Verfahren zur Messung der Lichtstrke in Hauptausstrahlungsrichtung und des (der) Ausstrahlwinkel(s) von Reflektorlampen (IEC/TR 61341:2010) This European Standard was approved by CENELEC on 2011-07
8、-04. CENELEC 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 obta
9、ined on application to the Central Secretariat or to any CENELEC 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 CENELEC member into its own language and notified to the Cent
10、ral Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxe
11、mbourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Foreword The text of the International Standard IEC/TR 61341:2010, prepared by SC 34A, Lamps, of IEC TC 34, Lamps and related equipment, was submitted to the Uniq
12、ue Acceptance Procedure and was approved by CENELEC as EN 61341 on 2011-07-04 without any modification. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such
13、patent rights. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2012-07-04 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2014-0
14、7-04 _ Endorsement notice The text of the International Standard IEC/TR 61341:2010 was approved by CENELEC as a European Standard without any modification. _ BS EN 61341:2011EN 61341:2011 (E) 2 CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.7 2 Terms and definitions .7 3 Basic beam patterns.8 4 General
15、conditions for measurement 8 5 Test arrangement .8 6 Measuring procedure9 7 Specification of centre beam intensity and beam angle(s).10 Bibliography11 Figure 1 Relation between optical beam axis, geometrical-mechanical axis, peak intensity and centre beam intensity.7 Figure 2 Measurement of luminous
16、 intensity distribution Figure 3 Case where the centre beam intensity is smaller than 50 % of the peak intensity BS EN 61341:2011EN 61341:2011 (E) 3 1010INTERNATIONAL ELECTROTECHNICAL COMMISSION _ METHOD OF MEASUREMENT OF CENTRE BEAM INTENSITY AND BEAM ANGLE(S) OF REFLECTOR LAMPS FOREWORD 1) The Int
17、ernational Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and ele
18、ctronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committ
19、ees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for S
20、tandardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee ha
21、s representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accura
22、te, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional
23、 publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in som
24、e areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents i
25、ncluding individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or r
26、eliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of th
27、e elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. The main task of IEC technical committees is to prepare International Standards. However, a technical committee may propose the publication of a te
28、chnical report when it has collected data of a different kind from that which is normally published as an International Standard, for example “state of the art“. IEC 61341, which is a technical report, has been prepared by subcommittee 34A: Lamps, of IEC Technical Committee 34: Lamps and related equ
29、ipment. The text of this technical report is based on the following documents: Enquiry draft Report on voting 34A/1340/DTR 34A/1371/RVC Full information on the voting for the approval of this technical report can be found in the report on voting indicated in the above table. BS EN 61341:2011EN 61341
30、:2011 (E) 4 This second edition cancels and replaces the first edition published in 1994 and constitutes a technical revision. Due to the increasing use of reflector equipped LED lamps, the scope has been broadened and measurement conditions been included in order to take account of these lamps. Fur
31、ther, for easier understanding of the relation between the different axis and different intensities, two figures have been added. The luminous intensity distribution shall be reported instead of the centre beam intensity, if the latter is very low (“butterfly” distributions). This publication has be
32、en drafted in accordance with the ISO/IEC Directives, Part 2. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the
33、publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. BS EN 61341:2011EN 61341:2011 (E) 5 INTRODUCTION While the light output of lamps is normally characterized by the luminous flux, for reflector lamps it is characterized by the centre beam intensity together with t
34、he beam angle(s). This Technical Report gives guidance with regard to the measurement and interpretation of these two basic characteristics of reflector lamps in order to allow the comparability of reported values. The adopted principles may help to classify lamps into beam angle groups; they are no
35、t intended for the assessment of individual lamps. For additional information, the reader is referred to the CIE Technical Report No 43, describing the photometric characteristics of floodlight luminaires. BS EN 61341:2011EN 61341:2011 (E) 6 METHOD OF MEASUREMENT OF CENTRE BEAM INTENSITY AND BEAM AN
36、GLE(S) OF REFLECTOR LAMPS 1 Scope This Technical Report describes the method of measuring and specifying the centre beam intensity and the associated beam angle(s) of reflector lamps. It applies to incandescent, tungsten halogen and gas-discharge and LED based reflector lamps for general lighting pu
37、rposes. It does not apply to lamps for special purposes such as projection lamps. These recommendations relate to design testing of lamps only. 2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.1 optical beam axis the axis about which the luminou
38、s intensity distribution is substantially symmetrical NOTE 1 The optical beam axis is not necessarily the same as the lamp axis through the lamp cap or the lamp axis normal to a reference plane on the reflector (e.g. the rim), see Figure 1. NOTE 2 It is assumed that only small (negligible) errors oc
39、cur when symmetry is determined visually. Figure 1 Relation between optical beam axis, geometrical-mechanical axis, peak intensity and centre beam intensity 2.2 peak intensity Ipthe highest value of the luminous intensity regardless of whether or not it occurs on the optical beam axis NOTE The peak
40、intensity is expressed in candela. 2.3 centre beam intensity Icthe value of the luminous intensity measured on the optical beam axis NOTE The centre beam intensity is expressed in candela. Optical beam axis Mechanical/geometrical axis Center beam intensity Peak intensity IEC 292/10 BS EN 61341:2011E
41、N 61341:2011 (E) 7 2.4 beam angle the angle between two imaginary lines in a plane through the optical beam axis, such that these lines pass through the centre of the front face of the lamp and through points at which the luminous intensity is 50 % of the centre beam intensity 3 Basic beam patterns
42、The following beam patterns, as displayed on a surface normal to the optical beam axis, can be distinguished. Symmetrical beam patterns, i.e. circular beams, for which measurements in any two planes at right angles are sufficient. Asymmetrical beam patterns, for example oval or elliptical beams, whi
43、ch require measurements in two planes coinciding with the major and minor axes (at right angles) of the projected beam pattern. Irregular beam patterns, with more than one point of maximum intensity, which require measurement in a number of planes. 4 General conditions for measurement For incandesce
44、nt and tungsten halogen lamps, prior to measurement, the lamp shall be aged for approximately 1 h at its rated voltage. The measurements shall be made with a supply voltage which is equal to the rated lamp voltage and which must be maintained constant within 0,5 %. If the lamp is marked with a volta
45、ge range, the test voltage shall be the mean of the voltage range. The lamp shall not be rotated around the lamp axis during measurement. For gas-discharge lamps, prior to measurement the lamp shall be aged for 100 h of normal operation. During the measurement the appropriate reference ballast at ra
46、ted input voltage and frequency shall be used. The position of the gas-discharge lamp shall not be changed during measurement. For LED based reflector lamps, the measurement shall be made at an ambient temperature of 25 C and at rated electrical operating conditions (voltage or current). The electri
47、cal operating conditions shall be maintained constant within 0,5 % at thermal equilibrium. If there is a temperature dependence of the luminous intensity of the LED based reflector lamp, the position shall not be changed during measurement. 5 Test arrangement The lamp is mounted in a suitable test f
48、acility, e.g. a photometer bench or directional photometer. The lamp is positioned at a suitable distance from the photo detector, i.e. the distance being greater or equal to the shortest test distance which is compatible with the inverse square law such that increasing the distance causes no practi
49、cal change in the intensity. The photo detector shall have spectral characteristics corrected according to the CIE spectral luminous efficiency curve for photopic vision. The photo detector measures illuminance, which is converted to luminous intensity by multiplying by the square of the distance. The position of the photo detector relative to the lamp can be varied so that measurements can be made over the field of illumination of the lamp. The distance between the lamp and the photo detect
