§ 431.325 - Units to be tested.

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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.

                    
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