nema-c78.376

ANSI C78.376-2001 (revision of ANSI C78.376-1996

her ican National Standard

for electric lamps- Specifications for the

Fluorescent Lamps

--- - - - Reproduced By GLOBAL & - - EN61NEERlHG DOCUMENIS - f With lhe Parnitsion Of NEMA -

Under Roy* Agreement -s '5.

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ANSI C78.376-2001 Revision of ANSI C78.376-1996

I American National Standard I Approved February 1,2001 Secretariat: American National Standards Lighting Group - NEMA 1

for electric lamps:

Specifications for the Chromaticity

of Fluorescent Lamps

An American National Standard implies a consensus of those substantially concerned with its scope and provisions. It is intended as a guide to aid the manufacturer, the consumer, and the general public. The existence of an American National Standard does not in any respect preclude anyone, whether he has approved the standard or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. Users are cautioned to obtain the latest editions. The American National Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute.

Copyright O 2001 by ANSLG - National Electrical Manufacturers Association 1300 North 17th Street, Suite 1847, Rosslyn, VA 22209



Approval of an American National Standard requires verification by ANSI that the requirements for due process, consensus, and other criteria for approval have been met by the standards developer. An American National Standard implies a consensus of those substantially concerned with its scope and provisions. Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a concerted effort be made toward their resolution. The existence of an American National Standard does not in any respect preclude anyone, whether s/he has approved the standard or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. It is intended as a guide to aid the manufacturer, the consumer, and the general public. The American National Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute. Requests for interpretations should be addressed to the Committee Secretariat referred to on the title page. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute.

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Copyright 02001 by American National Standard Lighting Group In Affiliation with National Electrical Manufacturers Association ,All rights reserved.

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li¡ (Copyright O 2001 by ANSLG -- National Electrical Manufacturers Association 1300 North 17th Street, Suite 1847, Rosslyn, VA 22209



CONTENTS

1 .

2 .

3 .

4 .

5 .

6 .

7 .

8 .

9 .

Foreword ....................................................................................................... v

Scope ........................................................................................................... 1

Color specification basis ............................................................................... 1

Nominal color temperature ........................................................................... 1

Objective chromaticities ............................................................................... 1

Chromaticity tolerances ................................................................................ 2

Table I - Objective chromaticities ................................................................ 2

Table 2 - Data for construction of ellipses ................................................... 2

Color rendering index ................................................................................... 3

Figure 1 - 2700K chromaticity limits ............................................................. 5

Figure 2 - 3000Wwarm chromaticity ............................................................ 7

Figure 3 - 3500Wwhite chromaticity limits ................................................... 9

1 O . Figure 4 . 4000W41 OOWcool white chromaticity ...................................... 11

I I .

12 .

Figure 5 . 5000K chromaticity limits ........................................................... 13

Figure 6 . 6500Wdaylight chromaticity limits ............................................. 15

iii Copyright O 2001 by ANSLG . National Electrical Manufacturers Association 1300 North 17th Street. Suite 1847. Rosslyn. VA 22209


ANSI C78.376-2001 Revision of C78.376-1996

THIS PAGE INTENTIONALLY

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Copyright O 2001 by American National Lighting Group/National Electrical Manufacturers Association 1300 North 17th Street, Suite 1847, Rosslyn, VA 22209

iv


ANSI C78.376-2001 Revision of C78.376-1996

Foreword (This Foreword is not part of ANSI C78.376-2001.)

Suggestions for improvement of this standard should be submitted to the Secretariat C78, American National Standards Lighting Group of the National Electrical Manufacturers Association, 1300 North 17th Street, Suite 1847, Rosslyn, VA 22209.

This standard was processed and approved by Accredited Standards Committee on Electric Lamps, C78, and its Subcommittee, C78-2. Committee approval of the standard does not necessarily imply that all committee members voted for that approval. At the time it approved this standard, the C78 Committee had the following members:

Al Rousseau, Chair C78 David T. Mullen and AI Rousseau, Technical Coordinators Randolph N. Roy, Secretariat Matt Clark, Coordinating Editor

Organization Represented: Name of Representative:

Advance Transformer Company Norman Grimshaw ENTERGY Services, Inc. GE Lighting Rolf Bergman Illuminating Engineering Society Rita Harrold InterTek Testing Services, Inc. MagneTek Lighting Products National Electrical Manufacturers Association (Vacant)

William “Al” Maguire

Craig Davenport Michael A. Stein

OSRAM SYLVANIA Peter Bleasby

Philips Lighting Company AI Rousseau Underwriters Laboratories, Inc. David Belt

David Mullen (Alt.)

Copyright O 2001 by ANSLG -- National Electrical Manufacturers Association 1300 North 17th Street, Suite 1847, Rosslyn, VA 22209



At the time it approved this standard, the C78-2 Sub-Committee had the following members:

David T. Muilen, Chair, C78-2 Randolph N. Roy, Secretariat

Organization Represented:

Advance Transformer Company

AROMAT-NAIS IETLAntertek Testing Services, Inc. General Electric

MagneTek

Motorola Lighting, Inc. OSRAM SYLVANIA INC.

IPhilips Lighting Company

'Thomas & Betts (American Electric) Underwriters Laboratories, Inc.

Name of Represen ta tive:

Norman Grimshaw Beth Jug Dail Swanson Craig Davenport Edward E. Hammer Rolf Bergman (Alt) William Dunham (Alt) Kenneth J. Denton (Alt) Bill Brosius Howard Wolfman David T. Mullen Tom Gavenonis (Alt) Frank M. Latassa Thomas O. Leyh Greg Steinman David Belt John Marshall (Alt)

vi Copyright O 2001 by ANSLG -- National Electrical Manufacturers Association 1300 North 17th Street, Suite 1847, Rosslyn, VA 22209


AMERICAN NATIONAL STANDARD for electric lamps -

Specifications for the Chromaticity of Fluorescent Lamps

1. Scope

This standard covers the objectives and tolerances for the chromaticity of T8, TIO and T I2 fluorescent lamps with a nominal loading of from 5 to 10 watts per foot at their normal 100 hour rating point. This standard also covers some compact lamps, where noted. The colors included are 2700K, 3000Wwarm white, 3500Wwhite, 4000W41 OOWcool white, 5000K, and 6500Wdaylight. 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.

2. Color specification basis

The x and y coordinates used in this specification are based on the 1931 CIE* Chromaticity Diagram. Lamps shall be rated in terms of the measurements standards established by the National Institute of Standards and Technology. Tolerances are based on the 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, Jan 1943, pp 18-26.

* International Committee on Illumination

3. Nominal color temperature

Values of correlated color temperature (CCT) will vary within a chromaticity tolerance ellipse since they are a function of color coordinates. For colors which 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 chromaticity by less than 100K. 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 shown in Table I.

1 Copyright O 2001 by ANSLG -- National Electrical Manufacturers Association 1300 North 17th Street, Suite 2847, Rossiyn, VA 22209



Table 1 - Objective chromaticities

__I 2709K (Note I)

3000Warm white

3500White

41 OOW4OOOWCool white

50i30K

6500WDayl ig ht

X

0.459

0.440

0.41 1

0.380

0.346

0.31 3

Y

0.41 2

0.403

0.393

0.380

0.359

0.337

12_0nly for T4 compact lames of less than 20 watts.

5. Chromaticity tolerances

For the lamps covered by this standard the chromaticity tolerance is defined by a 4 step MacAdam ellipse. 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 gil, Zg,;!, and g22 are taken from MacAdam's paper referred to above. They are the basis for calculating è, a, and b. è 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 one step ellipse, respectively.

Table 2 - Data for Construction of Ellipses

2700K (Note 1)

3000WWarm white

3500White

4000W41 OOWCool white

5000K

6500K/DayIight

g11

40 x I O 4

39 x i o 4

39.5 x i o 4 38 x I O 4

56 x I O 4

86 x IO4

2g12

-39 x i o 4 -39 x i o 4 -40 x i o4 -43 x i o 4 -50 x i o 4 -80 x i o 4

Q22

28 x I O 4

27.5 x i o 4 25 x I O 4

26 x I O 4

28 x i o 4 45 x I O 4

e 53' 42'

53' 13'

54O 00'

53O 43'

59O 37'

58' 34'

a

0.0027

0.00278

0.00309

0.0031 3

0.00274

0.00223

b

0.0014

0.001 36

0.001 38

0.001 34

0.0011 18

0.00095

I lJ For compact fluorescent lamps of less than 20 watts. -

2 Copyright O 2001 by ANSLG -- National Electrical Manufacturers Association 1300 North 17th Street, Suite 1847, Rosslyn, VA 22209



6. Cotor Renderinq Index (Rd

6.1 Definition 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 Qiven Igmp shall be determined in accordance with the method specified in CIE Publication 13.3. The required spectroradiometric measurement and characterization shall be conducted in accordance with methods given in IESNA LM-58 and IESNA LM-16 For compliance with federal requlations see I OCFR 430.24.

6.3 Specification The initial reading of the Color Renderinq Index. Ra, of a test lot shall not be less than the rated value decreased by three.





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0.425

0.42

0.41 5

Y

0.41

0.405

0.4 0.445 0.45 0.455 0.46 0.465 0.47

X

Figure 1 - 2700K Chromaticity Limits (4 MacAdam Color Steps)

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6 Copyright O 2001 by ANSLG -- National Electrical Manufacturers Association 'i300 North 17th Street, Suite 1847, Rosslyn, VA 22209



.425

.420

.415

.410

y .405

.400

.395

.390

.385 425 .430 .435 ,440 .445 .450 .455

X

Figure 2 - 3000Warm White Chromaticity Limits (4 MacAdam Color Steps)





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'6 Copyright O 2001 by ANSLG -- National Electrical Manufacturers Association 1300 North 17th Street, Suite 1847, Rosslyn, VA 22209



.415

.410

.405

.400

y .395

.390

.385

.380

,375 .395 ,400 .405 .41 O .415 ,420 .425

X

Figure 3 - 3500WWhite Chromaticity Limits (4 MacAdam Color Steps)

9 Copyright O 2001 by ANSLG - National Electrical Manufacturers Association 1300 North 17th Street, Suite 1847, Rossiyn, VA 22209




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.395

.390

,385

Y .380

.375

.370

.365 .365 ,370 .375 .380 .385 .390 .395

X

Figure 4 - 4000K/4100K/Cool White Chromaticity Limits (4 MacAdam Color Steps)

Copyright O 2001 by ANSLG - National Electrical Manufacturers Association 1300 North 17th Street, Suite 1847, Rosslyn, VA 22209

11



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Y

.375

,370

.365

.360

.355

.350

.345

.340

.335 .330 ,335 .340 .345 .350 ,355 .3óû

X

Figure 5 - 5000K Chromaticity Limits (4 MacAdam Color Steps)

13 Copyright O 2001 by ANSLG - National Electrical Manufacturers Association 1300 North 17th Street, Suite 1847, Rosslyn, VA 22209




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Y

.355

.350

.345

.340

.335

.330

.325

.320

.315 295 .300 .305 .3 1 O .3 1 5 .320 .325

X

Figure 6 - 6500WDaylight Chromaticity Limits (4 MacAdam Color Steps)

15 Copyright O 2001 by ANSLG - National Electrical Manufacturers Association 1300 North 17th Street, Suite 1847, Rocslyn, VA 22209


ANSI C78.376-2001 Revision of ANSI 678.376-1996

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16 Copyright Q 2001 by ANSLG -- National Electrical Manufacturers Association 1300 North 17th Street, Suite 1847, Rosslyn, VA 22209


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