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mercury vapor lamp ballast

Defined in 1 place of the United States Code.

Mercury vapor lamp ballast.—The term "mercury vapor lamp ballast" means 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.

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The term “mercury vapor lamp ballast” means a device that is designed and marketed to start and operate mercury vapor lamps by providing the necessary voltage and current.

Source

The term “mercury vapor lamp ballast” means 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.

Source