Statutes, codes, and regulations
Code of Federal Regulations
Title 10 - ENERGYChapter II - DEPARTMENT OF ENERGYSubchapter D - ENERGY CONSERVATIONPart 431 - ENERGY EFFICIENCY PROGRAM FOR CERTAIN COMMERCIAL AND INDUSTRIAL EQUIPMENTSubpart S - METAL HALIDE LAMP BALLASTS AND FIXTURES
ENERGY CONSERVATION STANDARDS
Section 431.326 - Energy conservation standards and their effective dates

10 C.F.R. § 431.326

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Current through October 31, 2024
Section 431.326 - Energy conservation standards and their effective dates
(a) Except as provided in paragraph (b) of this section, each metal halide lamp fixture manufactured on or after January 1, 2009, and designed to be operated with lamps rated greater than or equal to 150 watts but less than or equal to 500 watts shall contain-
(1) A pulse-start metal halide ballast with a minimum ballast efficiency of 88 percent;
(2) A magnetic probe-start ballast with a minimum ballast efficiency of 94 percent; or
(3) A nonpulse-start electronic ballast with either a minimum ballast efficiency of 92 percent for wattages greater than 250 watts; or a minimum ballast efficiency of 90 percent for wattages less than or equal to 250 watts.
(b) The standards described in paragraph (a) of this section do not apply to-
(1) Metal halide lamp fixtures with regulated lag ballasts;
(2) Metal halide lamp fixtures that use electronic ballasts that operate at 480 volts; or
(3) Metal halide lamp fixtures that;
(i) Are rated only for 150 watt lamps;
(ii) Are rated for use in wet locations; as specified by the National Fire Protection Association in NFPA 70 (incorporated by reference; see§ 431.323 ) ; and
(iii) Contain a ballast that is rated to operate at ambient air temperatures above 50 °C, as specified in UL 1029, (incorporated by reference; see§ 431.323 ).
(c) Except when the requirements of paragraph (a) of this section are more stringent (i.e., require a larger minimum efficiency value) or as provided by paragraph (e) of this section, each metal halide lamp fixture manufactured on or after February 10, 2017, must contain a metal halide ballast with an efficiency not less than the value determined from the appropriate equation in the following table:

Designed to be
operated with lamps of the following rated lamp wattage		Tested input
voltage[DOUBLE DAGGER][DOUBLE DAGGER]		 Minimum standard equation[DOUBLE DAGGER][DOUBLE DAGGER]
%
[GREATER THAN EQUAL TO]50 W and [LESS THAN EQUAL TO]100 WTested at 480 V(1/(1 + 1.24 * P^(-0.351))) - 0.020[DAGGER][DAGGER]
[GREATER THAN EQUAL TO]50 W and [LESS THAN EQUAL TO]100 WAll others1/(1 + 1.24 * P^(-0.351))
[GREATER THAN]100 W and [LESS THAN]150[DAGGER] WTested at 480 V(1/(1 + 1.24 * P^(-0.351))) - 0.020
[GREATER THAN]100 W and [LESS THAN]150[DAGGER] WAll others1/(1 + 1.24 * P^(-0.351))
[GREATER THAN EQUAL TO]150 [DOUBLE DAGGER] W and [LESS THAN EQUAL TO]250 WTested at 480 V0.880
[GREATER THAN EQUAL TO]150 [DOUBLE DAGGER] W and [LESS THAN EQUAL TO]250 WAll othersFor [GREATER THAN EQUAL TO]150 W and [LESS THAN EQUAL TO]200 W: 0.880
For [GREATER THAN]200 W and [LESS THAN EQUAL TO]250 W: 1/(1 + 0.876 * P^(-0.351))
[GREATER THAN]250 W and [LESS THAN EQUAL TO]500 WTested at 480 VFor [GREATER THAN]250 and [LESS THAN]265 W: 0.880
For [GREATER THAN EQUAL TO]265 W and [LESS THAN EQUAL TO]500 W: (1/(1 + 0.876 * P^(-0.351)) - 0.010
[GREATER THAN]250 W and [LESS THAN EQUAL TO]500 WAll others1/(1 + 0.876 * P^(-0.351))
[GREATER THAN]500 W and [LESS THAN EQUAL TO]1000 WTested at 480 VFor [GREATER THAN]500 W and [LESS THAN EQUAL TO]750 W: 0.900
For [GREATER THAN]750 W and [LESS THAN EQUAL TO]1000 W: 0.000104 * P + 0.822
For [GREATER THAN]500 W and [LESS THAN EQUAL TO]1000 W: may not utilize a probe-start ballast
[GREATER THAN]500 W and [LESS THAN EQUAL TO]1000 WAll othersFor [GREATER THAN]500 W and [LESS THAN EQUAL TO]750 W: 0.910
For [GREATER THAN]750 W and [LESS THAN EQUAL TO]1000 W: 0.000104 * P + 0.832
For [GREATER THAN]500 W and [LESS THAN EQUAL TO]1000 W: may not utilize a probe-start ballast

[DAGGER] Includes 150 W fixtures specified in paragraph (b)(3) of this section, that are fixtures rated only for 150 W lamps; rated for use in wet locations, as specified by the NFPA 70 (incorporated by reference, see § 431.323 ), section 410.4(A) ; and containing a ballast that is rated to operate at ambient air temperatures above 50 °C, as specified by UL 1029 (incorporated by reference, see § 431.323 ).

[DOUBLE DAGGER] Excludes 150 W fixtures specified in paragraph (b)(3) of this section, that are fixtures rated only for 150 W lamps; rated for use in wet locations, as specified by the NFPA 70, section 410.4(A) ; and containing a ballast that is rated to operate at ambient air temperatures above 50 °C, as specified by UL 1029.

[DAGGER][DAGGER] P is defined as the rated wattage of the lamp the fixture is designed to operate.

[DOUBLE DAGGER][DOUBLE DAGGER] Tested input voltage is specified in 10 CFR 431.324 .

(d) Except as provided in paragraph (e) of this section, metal halide lamp fixtures manufactured on or after February 10, 2017, that operate lamps with rated wattage [GREATER THAN]500 W to [LESS THAN EQUAL TO]1000 W must not contain a probe-start metal halide ballast.
(e) The standards described in paragraphs (c) and (d) of this section do not apply to-
(1) Metal halide lamp fixtures with regulated-lag ballasts;
(2) Metal halide lamp fixtures that use electronic ballasts that operate at 480 volts; and
(3) Metal halide lamp fixtures that use high-frequency electronic ballasts.

10 C.F.R. §431.326

74 FR 12075 , Mar. 23, 2009, as amended at 79 FR 7844 , Feb. 10, 2014