TimR <***@aol.com> wrote:
[fluorescent fixtures buzzing when cold]
Post by TimR
(60 Hz is halfway between Bb at 58 and Bnat at 62)
There may also be sound at 120 Hz and other harmonics, too.
Post by TimR
Do you think there's anything to it?
You might try pushing or tapping on various parts of the fixture while
it is lit to see if you can change the sound. Some fixtures have sheet
metal panels or diffusers/shades that are just clipped on, and moving
one of these panels just a little might help reduce the noise.
If you feel comfortable working on line-operated equipment, you could
turn off the lights, unplug them (if they plug in), remove the tubes,
and poke around inside the fixture for loose screws, nuts, clips, etc.
In particular, if you can see the ballast (the oblong black thing with
lots of wires coming out of it), check the nuts/screws/clips holding it
in. In a lot of fixtures, the wires from the ballast to the lamp
holders just sort of lay there; they aren't in a bundle or clipped to
anything. The wires themselves are usually not a big source of noise,
Don't leave any any clips, nuts, bolts, etc out of the fixture for
good - some of them are there to ensure that all parts of the fixture
are safely grounded. (This also helps the lamps start.) Be careful of
pinching wires between parts when you put the whole thing back together.
I hope this helps!