ANSI NEMA C78.377-2017 Electric Lamps Specifications for the Chromaticity of Solid-State Lighting Products.pdf

1、NEMA Standards Publication National Electrical Manufacturers Association ANSI C78.377-2017 Electric Lamps Specifications for the Chromaticity of Solid-State Lighting Products 2017 National Electrical Manufacturers Association ANSI C78.377-2017 American National Standard for Electric Lamps Specificat

2、ions for the Chromaticity of Solid-State Lighting Products Secretariat: National Electrical Manufacturers Association Approved: May 23, 2017 American National Standards Institute, Inc. 2017 National Electrical Manufacturers Association NOTICE AND DISCLAIMER The information in this publication was co

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12、e statement. ANSI C78.377-2017 Page i 2017 National Electrical Manufacturers Association AMERICAN NATIONAL STANDARD Approval of an American National Standard requires verification by The American National Standards Institute, Inc. (ANSI) that the requirements for due process, consensus, and other cr

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19、ectrical Manufacturers Association 1300 North 17 thStreet, Suite 900 Rosslyn, Virginia 22209 2017 National Electrical Manufacturers Association All rights, including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection of Litera

20、ry and Artistic Works, and the International and Pan American copyright 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 AmericaANSI C78.377-2017

21、Page ii 2017 National Electrical Manufacturers Association Foreword (This foreword is not a part of ANSI C78.377-2017) Suggestions for improvement of this standard are welcomed. They should be sent to; Secretary, ASC C78 National Electrical Manufacturers Association 1300 North 17 thStreet, Suite 900

22、 Rosslyn, VA 22209 This standard was processed and approved for submittal to ANSI by Accredited Standards Committee on Electric Lamps, C78. Approval of the standard is not meant to imply that all Committee members voted to approve it. . ANSI C78.377-2017 Page iii 2017 National Electrical Manufacture

23、rs Association CONTENTS Foreword ii Introduction 1 1. Scope 1 2. Normative References . 2 3. Definitions . 2 4. Chromaticity . 2 4.1 Basis 2 4.2 Nominal Cct And Target Cct . 2 4.3 Specifications 2 Annex A 7-Step Quadrangles . 5 Annex B 4 Step Quadrangles (Informative) . 11 Annex C 4-Step uv Circles

24、(Informative) 17 Annex D Conversions between CCT, Duv and (x, y) or (u, v) (Informative) . 22 Annex E Extended Specifications (Informative) . 26 Annex F Informative References 38 ANSI C78.377-2017 Page iv 2017 National Electrical Manufacturers Association ANSI C78.377-2017 Page 1 2017 National Elect

25、rical Manufacturers Association Introduction The purposes of this standard are, first, to specify the range of chromaticities recommended for general lighting with solid-state lighting products to ensure high-quality white light and, second, to categorize chromaticities with given tolerances so that

26、 the white light chromaticity of the products can be communicated to consumers. For this second purpose, the existing chromaticity standard (ANSI C78.376) for fluorescent lamps (FLRs) uses six nominal CCTs, some of which are given names such as Warm White (3000 K), Cool White (4100 K), and Daylight

27、(6500 K). These names are often printed on product packages to communicate nominal CCT of the products to consumers. 2700 K and 5000 K, however, do not have names. Each of the six FLR lamp nominal CCTs has tolerances given as ellipses in the CIE 1931 (x, y) chromaticity diagram. Four-step MacAdam el

28、lipses are used in ANSI C78.376, and seven-step MacAdam ellipses and seven-step quadrangles are used in the U.S. Environmental Protection Agencys (EPA) ENERGY STAR specifications for Lamps, V2.0, and Luminaires, V2.0. This chromaticity specification for LED products was developed to establish an ali

29、gnment with the existing fluorescent lamp standards, enabling the consistent appearance of various light sources within spaces where multiple technologies are employed. The use of quadrangles to specify the chromaticities comprising the nominal CCTs increases the overall yield complying with this st

30、andard while acknowledging that chromaticities previously excluded (i.e. within the quadrangles but outside of the corresponding MacAdam ellipses) are nonetheless very useful in many applications. This standard provides a basis for specifying chromaticity, explanation of a nominal CCT, target CCT, D

31、uv, and details of SSL chromaticity requirements. In the 2014 revision, the specifications for nominal CCTs of 2200 K and 2500 K were added. The annexes in this document provide the background information of this standard and tables and graphical representations of the specifications in this standar

32、d. In this revision, extended specifications are added as options for products designed with chromaticity points that may be suitable for some lighting applications. This standard does not render a judgment on the preference, perception of white or natural light. This ANSI standard simply extends th

33、e designation of chromaticity regions to include areas that are suitable for some lighting applications. The Extended Specification given in Table 2 is developed as a straightforward mathematical construct to expand the ANSI chromaticity specification. This standard specifies only standardized chrom

34、aticity regions and does not relate to color quality metrics such as fidelity, chroma saturation or color discrimination. 1 Scope The purpose of this standard is to specify the range of chromaticity for general lighting with solid-state lighting (SSL) products, as well as to ensure that the chromati

35、city of the products can be communicated to consumers. This standard applies to LED lamps, LED light engines and LED luminaires for general indoor lighting applications, and may apply more broadly. This document does not apply to lighting fixtures sold without a light source. This standard also does

36、 not apply to SSL products for some indoor applications that intentionally produce colored light. This document does not include OLED products. 1.1 Patent Disclaimer At the time of publication, it is possible that some of the elements of this document may be the subject of patent rights. When this S

37、tandard was approved for publication, the Accredited Standards Committee C78 and the National Electrical Manufacturers Association (NEMA) did not know of any patent ANSI C78.377-2017 Page 2 2017 National Electrical Manufacturers Association applications, patents pending, or existing patents. ASC C78

38、 shall not be held responsible for identifying any or all such patent rights. 2 Normative References All standards are subject to revision, and parties to agreements based on this American National Standard are encouraged to investigate the possibility of applying the most recent editions of the sta

39、ndards indicated below. CIE 15: 2004, Commission Internationale de lEclairage, Colorimetry, 3rd Edition ANSI/IES RP-16-10, Nomenclature and Definitions for Illuminating Engineering IES LM-79-08, Illuminating Engineering Society of North America, Approved Method for the Electrical and Photometric Mea

40、surements of Solid-State Lighting Products 3 Definitions Terms used in this document such as LED lamp and LED luminaire are defined in ANSI/IES RP-16-10. 4 Chromaticity 4.1 Basis The chromaticity coordinates and correlated color temperature (CCT) values used in this standard are based on the CIE col

41、orimetry system. While the chromaticity of light is expressed by chromaticity coordinates such as (x, y) and (u, v) the chromaticity of nominally white light can also be expressed by CCT and the distance from the Planckian locus. CCT is a more intuitive measure of the shade of white light than (x, y

42、) or (u, v). Since CCT is defined based on the (u, 2/3v) chromaticity diagram, the distance from the Planckian locus should be determined on the same diagram. It should be expressed as a signed value to indicate whether the chromaticity is above or below the Planckian locus. As such a distance param

43、eter with respect to the Planckian locus is not officially defined by the CIE, “Duv” (symbol: D uv ) is defined in this document as the closest distance from the Planckian locus on the (u, 2/3v) diagram, with “+” sign for above and “” sign for below the Planckian locus. 4.2 Nominal CCT and Target CC

44、T Nominal CCT is used to specify and communicate chromaticity information of a product, and, in this document, is a CCT value at 100 K steps that is closest to the target CCT of the product. A target CCT is the CCT value that the product is designed to produce. Individual samples of the product may

45、deviate from the target CCT due to production variation, which is normally controlled to be within a production tolerance. The same applies to target Duv. The target CCT and target Duv are also the center points of the tolerance range of these parameters in this document. 4.3 Specifications SSL prod

46、ucts included in this standard shall have chromaticity values that fall into one of the nominal CCT categories listed in Table 1 or Table 2. SSL products with a given nominal CCT shall have the defined target CCT and Duv, and the values of individual samples shall be within the tolerances of CCT and

47、 Duv as listed in Table 1 or Table 2. Measurement of chromaticity shall be made in accordance with methods given in the measurement standard IES LM-79-08. ANSI C78.377-2017 Page 3 2017 National Electrical Manufacturers Association 4.3.1 Basic Specification SSL products included in this Basic Specifi

48、cation shall have chromaticity values that fall into one of the CCT categories listed in Table 1. Table 1 Basic Nominal CCT Specification Nominal CCT Category (K) Target CCT and Tolerance (K) Target Duv Duv Tolerance 2200 2238 102 0.0000 T x : CCT of the source For T x 2870K 0.000 0.0060 For T x 287

49、0K 2500 2460 120 0.0000 2700 2725 145 0.0000 3000 3045 175 0.0001 3500 3465 245 0.0005 4000 3985 275 0.0010 4500 4503 243 0.0015 5000 5029 283 0.0020 5700 5667 355 0.0025 6500 6532 510 0.0031 Flexible CCT (2300 6400) a. T Fis chosen to be at 100 K steps (2300, 2400, ., 6400 K), excluding the first ten CCTs listed in Table 1. b. T F= 1.1900x10 -8x T F 3 1.5434x10 -4x T F 2+ 0.7168 x T F 902.55 c. D uv (T) = 0 for T2870K, D uv (T) = 57700 x (1/T) 2 44.6 x (1/T) + 0.00854 for T2870K. 4.3.2 Extended Specification SSL products