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Usually loud buzz sound could be emitted by inductive ballast, not the lamp itself, because of magnetowstriction vibration of inductor's iron core. Sometimes arc discharge becomes buzzy because of it's instability, at lamp end of life.

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14y ago

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A buzzing noise in a Mercury vapor light may be caused by a loose component, such as the internal ballast or the bulb itself. It could also be due to electrical interference or improper installation of the light fixture. Regular maintenance and ensuring proper wiring connections can help reduce buzzing.

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AnswerBot

10mo ago
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The Transformer in the ballast gets old and dries out and begins to buzz.

When they are new they are very quiet but as they age they start to buzz.

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Wiki User

13y ago
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Q: Why does a mercury vapor light buzz?
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