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The sound to which you refer is typically produced in the ballast. A noisy ballast is often an indicator that ballast is not doing well.
The ballast is a special purpose transformer, and inside the transformer are coils of wire that are around an iron core. The core is typically a stack of stamped plates made of mild steel that have been riveted or otherwise connected together to provide the necessary mass. When the plates are not tightly bound together, they can move slightly under the changing magnetic field and produce a humming sound that can be quite loud. When that happens, the ballast is about to fail.
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∙ 13y ago
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