You Will Have To Replace Your T-12's At Some Point....The Question Is...When?
T-12 Being Phased Out
Ballasts
Replacement ballasts for T-12 Fixtures are no longer being manufactured. This is part of a long term phaseout which began in 2005. Manufacturers stopped producing the ballasts after July 2010. As long as your ballast doesn't burn out, you will have nothing to worry about.