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Fluorescent Ballasts

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Fluorescent ballasts regulate the electrical supply to fluorescent lamps, providing the starting voltage required to ignite the arc and then limiting current during operation to prevent the lamp from drawing excessive power. Without a properly matched ballast, a fluorescent lamp will either fail to start or burn out prematurely, making ballast selection and maintenance a routine part of commercial facility upkeep.

Electronic ballasts have largely replaced older magnetic (core-and-coil) designs in commercial applications, offering higher efficiency, quieter operation, and reduced lamp flicker. Most modern electronic ballasts operate at high frequency (typically 20,000 Hz or above), which eliminates the 60 Hz flicker associated with older magnetic ballasts and improves lamp life. Instant-start, rapid-start, and programmed-start ballasts each have specific applications based on how frequently the lamps are cycled on and off.

RelightDepot carries fluorescent ballasts for the most common commercial lamp types, organized by tube size for fast lookup. Browse T8 Ballasts for the most widely used commercial fluorescent size, T5 and T5HO Ballasts for high-output linear applications. Emergency backup units are available in the Fluorescent Emergency Ballasts section. The full Ballasts and Drivers catalog covers all ballast types in one section.