CFR > Title 10 - Energy > CHAPTER II—DEPARTMENT OF ENERGY > SUBCHAPTER D—ENERGY CONSERVATION (parts 400 to 491) > PART 431—ENERGY EFFICIENCY PROGRAM FOR CERTAIN COMMERCIAL AND INDUSTRIAL EQUIPMENT > SUBPART S—Metal Halide Lamp Ballasts and Fixtures (§431.321 to §431.329) > 431.325—Units to be tested.

431.325—Units to be tested.

For each basic model of metal halide lamp ballast selected for testing, a sample of sufficient size, no less than four, shall be selected at random and tested to ensure that:
(a) Any represented value of estimated energy efficiency calculated as the measured output power to the lamp divided by the measured input power to the ballast (Pout /Pin ), of a basic model is no less than the higher of:
(1) The mean of the sample, or
(2) The upper 99-percent confidence limit of the true mean divided by 1.01. (b) Any represented value of the energy efficiency of a basic model is no greater than the lower of:
(1) The mean of the sample, or
(2) The lower 99-percent confidence limit of the true mean divided by 0.99.

Code of Federal Regulations

[75 FR 10968, Mar. 9, 2010]