[RFI] Singing Floodlights

Larry Burke WI5A Larry Burke WI5A <lburke@wt.net>
Fri, 07 Jul 2000 20:47:14 -0500

This is not technically an RFI problem, but it's somewhat related. I have 
four 75 watt recessed floodlights in the ceiling of my shack. As they age 
and get ready to burn out they produce a singing sound for several days... 
then poof. What causes the noise?  Also... the lights seem to experience 
sympathy pains... when one goes out the others are not far behind. Is the 
later problem due to the increased voltage present when the first one blows 
or what? I wouldn't have thought the increase was enough to cause a problem.

Perspiring minds want to know.

Larry Wi5A

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