1、NEMA Standards PublicationNational Electrical Manufacturers AssociationANSI C78.376-2014Electric Lamps - Specifications for theChromaticity ofFluorescent LampsANSI C78.376-2014 American National Standard for Electric Lamps Specifications for the Chromaticity of Fluorescent Lamps Secretariat: Nationa
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20、en permission of the publisher. Printed in the United States of America 2014 National Electrical Manufacturers Association i ANSI C78.376-2014 Foreword (This foreword is not part of ANSI C78.376-2014.) This is a revised standard recently updated by American National Standards Committee C78 on Electr
21、ic Lamps. Suggestions for improvement of this standard are welcome. They should be sent to: Secretary, ASC C78 National Electrical Manufacturers Association 1300 North 17thStreet, Suite 900 Rosslyn, Virginia 22209 This standard was developed and approved for submittal to ANSI by Accredited Standards
22、 Committee C78 on Electric Lamps and its Working Group, C78WG02. Approval of this standard is not meant to imply that all Accredited Standards Committee members voted to approve it. This revision modifies specifications for the chromaticity of fluorescent lamps in ANSI C78.376-2001. It updates and p
23、artially harmonizes this ANSI standard with the IEC chromaticity color point objectives and chromaticity tolerance in IEC60081, Annex D. The major changes: a) The color chromaticity mean shall be within a 4-step MacAdam ellipse of the objective chromaticity. b) 95% of samples shall be within a 5-ste
24、p MacAdam ellipse of the objective chromaticity. c) The 3500K objective chromaticity shall be changed to the IEC 3500K objective chromaticity. ii 2014 National Electrical Manufacturers Association ANSI C78.376-2014 Contents Foreword . ii 1 Scope 1 2 Color Specification Basis . 1 3 Nominal Color Temp
25、erature . 1 4 Objective Chromaticities 1 5 Chromaticity Tolerances 1 6 Color Rendering Index (Ra) 2 6.1 Definition . 2 6.2 Measurement 2 6.3 Specification 2 7 Effective Date. 2 Figures Figure 1 2700K Chromaticity Limits 3 Figure 2 3000K Chromaticity Limits 3 Figure 3 3500K Chromaticity Limits 4 Figu
26、re 4 4000K/4100K Chromaticity Limits 4 Figure 5 5000K Chromaticity Limits 5 Figure 6 6500K Chromaticity Limits 5 Tables Table 1 Objective Chromaticities. 1 Table 2 Data for Construction of Ellipses 2 2014 National Electrical Manufacturers Association iii ANSI C78.376-2014 iv 2014 National Electrical
27、 Manufacturers Association ANSI C78.376 - 2014 1 Scope This standard covers the objectives and tolerances for the chromaticity of fluorescent lamps at their normal 100 hour rating point. The colors included are 2700K, 3000 K/warm white, 3500K/white, 4000K/4100K/cool white, 5000K, and 6500K/daylight.
28、 The lamp under test shall be operated under reference conditions as specified in ANSI C78.375, Guide for Operation of Fluorescent Lamps, and in the relevant C78 lamp standard. For lamps with non-standardized chromaticity coordinates, the rated x and y values shall be assigned by the manufacturer or
29、 responsible vendor. 2 Color Specification Basis The x and y coordinates used in this specification are based on the 1931 CIE1Chromaticity Diagram. Lamps shall be rated in terms of the measurements standards established by the National Institute of Standards and Technology. Tolerances are based on t
30、he ellipses defined by David L. MacAdam in his paper “Specification of Small Chromaticity Differences,” printed in Journal of the Optical Society of America, Vol. 33, No. 1, January 1943, pp. 18-26. 3 Nominal Color Temperature Values of correlated color temperature (CCT) will vary within a chromatic
31、ity tolerance ellipse, since they are a function of color coordinates. For colors that are designated by nominal color temperature, the value shall be based on the CCT of the objective chromaticity. For new colors, the nominal value of the color temperature shall differ from the CCT of the objective
32、 chromaticity by less than 100 K. For a color with a nominal color temperature generally established prior to this standard, the value may be retained when it differs from the CCT of the objective chromaticity by a slightly greater amount. 4 Objective Chromaticities The objective chromaticities are
33、shown in Table 1. Table 1 Objective Chromaticities x y 2700K 0.459 0.412 3000K/Warm White 0.440 0.403 3500K 0.409 0.394 4000K/4100K/Cool White 0.380 0.380 5000K 0.346 0.359 6500K/Daylight 0.313 0.337 5 Chromaticity Tolerances For lamps covered by this standard, the distribution of chromaticity coord
34、inates from a representative production sample shall meet the following criteria: a) Mean of the sample shall be within a 4-step MacAdam ellipse of the objective chromaticity. b) 95% of samples shall be within a 5-step MacAdam ellipse of the objective chromaticity. 1International Committee on Illumi
35、nation 2014 National Electrical Manufacturers Association 1 ANSI C78.376-2014 The ellipses are shown in figures 1 through 6. In the construction of these ellipses, the data shown in Table 2 are used. The values of g11, 2g12, and g22are taken from MacAdams paper referred to above. They are the basis
36、for calculating , a, and b. is the angle between the major axis of the ellipse and the x axis. a and b are major and minor semi-axis of a 1-step ellipse, respectively. Table 2 Data for Construction of Ellipses g112g12g22 a b 2700K 40 x 104-39 x 10428 x 10453 42 0.00270 0.00140 3000K/Warm White 39 x
37、104-39 x 10427.5 x 10453 13 0.00278 0.00136 3500K/White 38 x 104-40 x 10425 x 10452 580.00317 0.00139 4000K/4100K/Cool White 39.5 x 104-43 x 10426 x 10453 43 0.00313 0.00134 5000K 56 x 104-50 x 10428 x 10459 37 0.00274 0.00118 6500K/Daylight 86 x 104-80 x 10445 x 10458 34 0.00223 0.00095 6 Color Ren
38、dering Index (Ra) 6.1 Definition The Color Rendering Index, or CRI, is the measurement of degree of color shift objects undergo when illuminated by a reference source of comparable color temperature. It is abbreviated Ra. 6.2 Measurement The value for CRI for a given lamp shall be determined in acco
39、rdance with the method specified in CIE Publication 13.3. The required spectroradiometric measurement shall be conducted in accordance with methods given in IESNA LM-58. 6.3 Specification The initial reading of the CRI, Ra, of a test lot shall not be less than the rated value decreased by three. 7 E
40、ffective Date The revised 3500K objective chromaticity and chromaticity tolerance requirements become effective January 1, 2016. 2 2014 National Electrical Manufacturers Association ANSI C78.376-2014 Figure 1 2700K Chromaticity Limits Figure 2 3000K Chromaticity Limits 2014 National Electrical Manuf
41、acturers Association 3 ANSI C78.376-2014 Figure 4 4000K/4100K Chromaticity Limits Figure 3 3500K Chromaticity Limits 4 2014 National Electrical Manufacturers Association ANSI C78.376-2014 Figure 5 5000K Chromaticity Limits Figure 6 6500K Chromaticity Limits 2014 National Electrical Manufacturers Association 5 NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION 1300 NORTH 17TH STREET, SUITE 900 ROSSLYN. VA 22209www.NEMA.orgTO ORDER ADDITIONAL NEMA STANDARDS VISITWWW.GLOBAL.IHS.COM OR CALL 1-800-854-7179/1-303-397-79565612_0514TB
