W hen your fluorescent light flickers or makes a loud and annoying hum, a degrading ballast could be the cause. Replacing a ...

Ballasts are power supplies or transformers for fluorescent lamps, light sources that consist of a glass tube filled with argon, neon, or other inert gas. When ballasts supply electrical current, the ...

The four tube sockets are fastened to the corners of the base pan. A sheet-metal coverplate protects the wiring and ballast. Figure 8-8: Exploded view of the parts of a two-tube fluorescent luminaire.