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A high-intensity discharge (HID) ballast is a device required by a high-intensity discharge (HID) light (either bus or ballast lighting) to regulate the current and voltage supplied to the bulb during the beginning.
HID ballasts also supply enough current and voltage during operation to keep halogen lights from failing.
HID ballasts can also assist to minimize the total size of an HID light, making HID systems more compact and transportable.
The phrase "ballast" refers to a variety of technologies, including ballast systems and fuel cells.
With the introduction of HID (High-Intensity Discharge) lighting systems in 1970, the term "ballast" was first employed.
The ballast in an HID ballast system is made up of the light source, its photoresistor, and the ballast holder.