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The short answer is "something bad." The first thing I'd try is tightening the bulb - a loose fit might spark a little, and sparks make all kinds of weird sounds (howling, zapping, and any bizzare combination of the two, so I wouldn't rule out that being the cause of whistling). If it keeps up, you might want to try a new light bulb, since the current one seems to be defective. And if that doesn't fix it, it's something wrong with your light fixture. If it's something small, you might be able to get help at a hardware store; large or permenant fixtures are more difficult - I can only suggest calling an electrician, though considering the expense, that's a last resort option.

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15y ago

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