1、NEMA Standards PublicationNational Electrical Manufacturers AssociationANSI C78.379-2006 (R2015)Electric Lamps Classification of the Beam Patterns of Reflector LampsC78.379-2006 (R2015) American National Standard for Electric Lamps Classification of the Beam Patterns of Reflector Lamps Secretariat:
2、National Electrical Manufacturers Association Approved: June 25, 2015 American National Standards Institute, Inc. 2015 National Electrical Manufacturers Association NOTICE AND DISCLAIMER The information in this publication was considered technically sound by the consensus of persons engaged in the d
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11、ealth purposes. Any certification or other statement of compliance with any health- or safety-related information in this document shall not be attributable to NEMA and is solely the responsibility of the certifier or maker of the statement. ANSI C78.379-2006 (R2015) Page i 2015 National Electrical
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19、e 900 Rosslyn, Virginia 22209 2015 National Electrical Manufacturers Association All rights, including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection of Literary and Artistic Works, and the International and Pan American c
20、opyright conventions. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without prior written permission of the publisher. Printed in the United States of America ANSI C78.379-2006 (R2015) Page ii 2015 National Electrical Manufacturers Associa
21、tion Foreword (This foreword is not part of American National Standard C78.379-2006 R2015.) Suggestions for improvement of this standard should be submitted to: Secretariat C78 National Electrical Manufacturers Association 1300 North 17th Street, Suite 900 Rosslyn, Virginia 22209 This standard was p
22、rocessed and approved by Accredited Standards Committee on Electric Lamps, ASC C78. Approval of the standard does not necessarily imply that all Committee members voted for that approval. ANSI C78.379-2006 (R2015) Page iii 2015 National Electrical Manufacturers Association Contents Foreword . ii 1 S
23、cope, Purpose, and Application 1 1.1 SCOPE 1 1.2 PURPOSE . 1 1.3 Application . 1 2 Normative References 1 3 Definitions . 1 3.1 BEAM AXIS . 1 3.2 CENTER BEAM INTENSITY (IC) 1 3.4 BEAM ANGLE (OF SYMMETRICAL BEAMS) 2 3.5 BEAM ANGLE (OF ASYMMETRICAL BEAM) 2 3.6 NOMINAL BEAM ANGLE 2 3.7 BEAM PATTERN . 2
24、 3.8 FLOOD 2 3.9 SPOT . 2 4 Beam Angle Classifications and Tolerances 3 4.1 NOMINAL BEAM ANGLE CLASSIFICATIONS . 3 4.2 ASYMMETRICAL BEAM CLASSIFICATION 4 4.3 BEAM ANGLE TOLERANCE OF PAR AND R LAMPS 4 5 Procedure for the Center Beam Intensity and Beam Angle 4 6 Determination of Light Output Intensity
25、 5 7 Lamp Descriptions 5 Annex A (Normative) Center Beam Intensity for Complex Beam Patterns 6 Figures Figure 1 Simplified Presentation of a Symmetric Beam Angle 40 3 Figure 2 Simplified Presentation of an Asymmetrical Beam Angle of 40 x 20 3 Figure A1 Center Beam Intensity . 6 ANSI C78.379-2006 (R2
26、015) Page iv 2015 National Electrical Manufacturers Association ANSI C78.379-2006 (R2015) Page 1 2015 National Electrical Manufacturers Association 1 Scope, Purpose, and Application 1.1 SCOPE This standard describes a system for classification of beam patterns and beam angles of reflector lamps. Als
27、o a method of describing light output is defined. Reflector lamps are considered to be those lamps having a reflective coating applied to the reflector part of the bulb or a reflector permanently attached to the bulb with the reflector at least partially controlling the light flux distribution. Part
28、ial reflector lamps are also covered. Both symmetrical and asymmetrical beams can be classified. Lamps with various kinds of light sources are covered. 1.2 PURPOSE The purpose of this standard is to provide a means to designate nominal beam angles and define expected tolerances about the nominal. Th
29、is classification applies only to bare lamps and excludes luminaires or other systems. 1.3 APPLICATION The definitions and classification included in this standard apply only to lamps for general lighting applications. 2 Normative References The following publications contain provisions which, throu
30、gh reference in this text, constitute provisions of this American National Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this American National Standard are encouraged to investigate the possibility
31、of applying the most recent editions of the publications indicated below. ANSI C78.21-2003, Incandescent PAR and R shapes ANSI C78.40-1992, Specifications for Mercury lamps ANSI C78.42-2004, High pressure Sodium lamps ANSI C78.43-2005, Single-end Metal Halide lamps ANSI C78.380-2005, Method of desig
32、nation of HID lamps ANSI C78.1340 1990, 450-Watt, 230-volt self-ballasted Mercury lamps ANSI C78.1341 1990, 750-Watt, 120-volt self-ballasted Mercury lamps ANSI C78.1342 1990, 160-Watt, 120-volt self-ballasted Mercury lamps ANSI C78.1380 1988, 250-Watt, 120-volt self-ballasted Mercury lamps ANSI/IES
33、 RP-16-1996, Nomenclature and definitions for illuminating engineering IES LM20-1994, Approved method for photometric testing of reflector type lamps 3 Definitions 3.1 BEAM AXIS The axis about which the light output flux is substantially symmetrical. In symmetrical beams, light flux is substantially
34、 symmetrical about the beam axis in planes through all rotational angles about the lamp and the beam axis. In asymmetrical beams, light flux is substantially symmetrical in two planes 90 from each other and through the beam axis. The beam axis may or may not coincide with lamp axis through the lamp
35、base or the lamp axis normal to the plane of any fixed points on the reflector. 3.2 CENTER BEAM INTENSITY (IC) The value of light flux intensity in candelas (cd) measured on the beam axis. See figures 1, 2 and A1. ANSI C78.379-2006 (R2015) Page 2 2015 National Electrical Manufacturers Association No
36、te 1 The formerly used terms “maximum center beam candlepower” and “approximate average candlepower in central 5 /10 cone” are superseded by the term center beam intensity. 3.3 PEAK INTENSITY (IP) The highest value of light flux intensity in candelas (cd) regardless of whether or not it occurs on th
37、e beam axis. See Figure A1. Note 1 An Ip point that falls outside of the beam angle may be ignored. 3.4 BEAM ANGLE (OF SYMMETRICAL BEAMS) The angle, in degrees (), between the two opposite directions in which the average intensity is 50% of the center beam intensity as measured in at least two rotat
38、ional planes, 90from each other, around and through the beam axis. See Figure 1. The beam angle is the angle between the two defined limitation points with its apex at the face of the lamp. It is not an angle between one limitation point and the axis. 3.5 BEAM ANGLE (OF ASYMMETRICAL BEAM) Those two
39、angles, the largest and the smallest each derived in accordance with 3.4, which lie in the two planes at 90 to each other. See Figure 2. 3.6 NOMINAL BEAM ANGLE A suitable approximate value, declared by the manufacturer, used to designate the beam angle of the lamp. 3.7 BEAM PATTERN The pattern of li
40、ght displayed on a surface normal to the beam axis. 3.8 FLOOD A generic commercial term that does not by itself define a specific beam angle. Typical use would be for beam angles of 25 degrees or more. The term flood is frequently used with a modifier, e.g. wide flood. 3.9 SPOT A generic commercial
41、term that does not by itself define a specific beam angle. Typical use would be for beam angles no greater than 20 degrees. The term spot is frequently used with a modifier, e.g. narrow spot. ANSI C78.379-2006 (R2015) Page 3 2015 National Electrical Manufacturers Association Figure 1 Simplified Pres
42、entation of a Symmetric Beam Angle 40 Figure 2 Simplified Presentation of an Asymmetrical Beam Angle of 40 x 20 4 Beam Angle Classifications and Tolerances 4.1 NOMINAL BEAM ANGLE CLASSIFICATIONS The following recommendations apply to lamps that are designated by a nominal beam angle. For some types
43、a reflector lamp may be classified simply in a general category of spot or flood. In many ANSI C78.379-2006 (R2015) Page 4 2015 National Electrical Manufacturers Association cases a specific nominal beam angle may also be identified, e.g. SP6, FL40. For beam angles of less than 13 the angle rounded
44、to the nearest whole number should be used: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,12. For beam angles of 13 to 50 the angle rounded to the nearest 5 (starting at 15) should be used: 15, 20, 25, 30, 35, 40, 45, 50. For beam angles of 51 or greater, the angle rounded to the nearest 10 should be used: 50,
45、60,70, 80, and 90. 4.2 ASYMMETRICAL BEAM CLASSIFICATION For asymmetrical beam patterns, for example an oval beam, the overall classification shall contain a wide angle sub-classification and a narrow angle sub-classification. Classification angles established using the method of 4.1 shall be employe
46、d for each part of a lamp description. In the classification of an asymmetrical pattern, the wide angle sub-classification shall appear first followed by the narrow angle sub-classification. An example of an asymmetrical classification is: 40x20. 4.3 BEAM ANGLE TOLERANCE OF PAR AND R LAMPS Beam angl
47、es used in designations are nominal values. However, beam angles of PAR and MR lamps, made from pressed glass lenses and reflectors, vary considerably over time from mold wear. Similarly, blown glass R, BR, ER, and BRL lamps have a wide variation due to changes in frost density and light center leng
48、th. The following are normally expected tolerances from the nominal value. Beam Angle Tolerance PAR and MR Lamps R Lamps Beam Angle Tolerance Beam Angle Tolerance 1 to 12 +/- 3 All +/- 12 15 +/- 4 20 to 40 +/- 6 45 & higher +/- 10 5 Procedure for the Center Beam Intensity and Beam Angle General proc
49、edures for the photometric testing of reflector lamps having symmetrical or asymmetrical beams can be found in IES LM20. 5.1 Move the lamp or photodetector until the photodetector is on the beam axis, as defined in clause 3.1. For wide-angle flood lamps, the photodetector may be retained on the lamp axis since there is little or no difference in light intensity between the beam axis and lamp axis. At this point, measure the center beam intensity, Ic. Record the measured value of Ic for use in the determination of the
