ballast efficiency
Defined in 1 dictionary — U.S. Code
United States Code
42 U.S.C. § 6291 — for purposes of this part (6 versions over time)
The term “ballast efficiency” means, in the case of a high intensity discharge fixture, the efficiency of a lamp and ballast combination, expressed as a percentage, and calculated in accordance with the following formula: Efficiency = Pout/Pin.