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T12 Ballasts

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T12 fluorescent ballasts power the older T12 lamp format, the 1.5-inch diameter fluorescent tubes that were the commercial standard prior to the widespread adoption of the more efficient T8 format. While new T12 lamp production has been phased out in the United States under EPACT energy regulations, a significant installed base of T12 fixtures remains in older commercial buildings, schools, warehouses, and industrial facilities that have not yet completed a retrofit to T8 or LED.

Facility maintenance teams maintaining legacy T12 systems need replacement ballasts to keep existing fixtures operational until a planned retrofit or renovation occurs. T12 ballasts are available in magnetic (core-and-coil) and electronic types. Electronic T12 ballasts are compatible with certain T12 lamp types and offer improvements in efficiency and flicker reduction compared to the magnetic designs they replace. It is worth noting that some T12 fixtures can be converted to T8 operation using a compatible T8 ballast and T8 lamps with appropriate adapters, which may be a practical path forward for facilities managing long-term ballast replacement costs.

RelightDepot carries T12 ballasts in magnetic and electronic configurations for facilities maintaining legacy fluorescent systems. For modern fluorescent alternatives, browse our T8 Ballasts and T5 and T5HO Ballasts. Replacement fluorescent lamps across all tube sizes are available in our Fluorescent Lamps section. The complete Fluorescent Ballasts category is organized by lamp type for easy cross-referencing.