Why do some CFL's buzz? « on: April 04, 2009, 09:32:01 AM » Author: lightman64
What makes some CFL's have that annoying buzz to them?
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	Re: Why do some CFL's buzz? « Reply #1 on: April 04, 2009, 10:04:39 AM » Author: TudorWhiz
the magnetic ones or the electronic ones?
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	Re: Why do some CFL's buzz? « Reply #2 on: April 04, 2009, 10:10:02 AM » Author: lightman64
Either
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The future of street lighting is Induction, not nasty HPS lights or cr@ppy LED lights!
Preheat CFL's should make a comeback!

	Re: Why do some CFL's buzz? « Reply #3 on: April 04, 2009, 10:40:42 AM » Author: Medved
Magnetic: Loose ballast core assembly, magnetostriction in it Electronic: The main ballasting coil magnetic assembly, when the filtering capacitor is ready to die - it does not filter the rectified mains as well, so the HF current (normally not audible) is strongly amplitude-modulated by 100/120Hz. And sometimes the buzz originate from the EMC filter coil when is connected before the filtering capacitor - as high current pulses flow trough it (when the filtering capacitor is recharged).
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	Re: Why do some CFL's buzz? « Reply #4 on: April 04, 2009, 12:44:52 PM » Author: bluelights
I have never heard a CFL buzz, but I guess that could be the cathodes filaments vibrating?
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