### Question
What is the definition of mercury vapor lamp ballast?


### Answer
The definition of **mercury vapor lamp ballast** is as follows in *42 U.S.C. § 6291*:

> a device that is designed and marketed to start and operate mercury vapor lamps intended for general illumination by providing the necessary voltage and current

#### Citation:
  - *42 U.S.C. § 6291*
  - Heading: **CHAPTER 77-ENERGY CONSERVATION > SUBCHAPTER III-IMPROVING ENERGY EFFICIENCY > Part A-Energy Conservation Program for Consumer Products Other Than Automobiles**

