Definition

Noun: * An electrical device used to provide the necessary starting voltage and then to limit the operating current for fluorescent and discharge lamps. It ensures the lamp starts correctly and operates at a stable, safe current.

Usage

• The term "light ballast" is a compound noun. It is used specifically in the context of electrical lighting systems.
• It functions as a standard noun and can be modified by adjectives (e.g., light ballast, light ballast).

Examples

• The light ballast in the office fixture hummed loudly before it failed.
• To fix the flickering fluorescent tube, you may need to replace the light ballast.
• Modern light ballasts are more energy-efficient than the older magnetic versions.

Advanced Usage

• The term is often shortened to just "ballast" in technical and trade contexts when the type of lighting is already understood (e.g., "The ballast needs replacing.").
• It is a key component in High-Intensity Discharge (HID) lighting systems, such as those used in streetlights and stadiums, as well as in standard fluorescent lighting.

Variants and Related Words

• Ballast (n.): The more common, shortened form of "light ballast."
• Electrical ballast (n.): A more general technical term.
• Starter (n.): A related but distinct component used in some older fluorescent lamp circuits to initiate the electrical arc. A ballast may work with or incorporate a starter.

Synonyms

• Current limiter (n.): Describes one of its primary electrical functions.
• Control gear (n.): A broader term used in lighting engineering for components that regulate lamp operation.

Notes on Different Meanings

• Ballast (Maritime): In a completely different context, "ballast" refers to heavy material placed in a ship to improve its stability. The "light ballast" for lamps is an unrelated, specialized electrical term.

Noun

1. an electrical device for starting and regulating fluorescent and discharge lamps