no cannot say I have heard of it as normally they use switch mode psus and
nothing else vibrates. Really you need a magnetic component at 50hz for
that noise. With regard to the broken pins, I'd be tempted to araldite them
in where they should be to stop the light working free and falling on
somebody or inside the diffuser.


Try a gentle squeeze of the plastic ends, probably wearing gloves to see if
the noise changes in character. Could there be an earth not making very good
contact between the fitting and a large bit of metal. I've noticed
electrostatic hums, though they tend to be tinny sounding and shuffling the
movable bits soon stops them.
Brian

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This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please
Note this Signature is meaningless.!
"T i m" wrote in message
...
After being given the 4 x 6' 30W LED fluorescent tube replacements
(and Non-starter fuses) I was extra aware of the now 'unnecessary
mains hum from the fitting.

This morning I by-passed the ballast (and took the cap out while I was
there), put the tube back in, turned the light back on and the hum was
still there?! ;-(

Undid the non-starter, hum stops?

The other tube in the other fitting also hums (or that could also be /
partly the ballast that is still in circuit).

Whoever removed the LED tubes and put them in the storage unit isn't
familiar with them and must have plonked them down on their end and I
noticed that the pins on the non 'input' end of the two I hadn't used
till today have been mostly pushed inside the partly broken end cap.
;-(

Luckily they don't need to be used so I'm going to remove them
completely and re-wire the fitting further to just retain the
non-starter and the one 'live end' (I don't think I need the pins to
be able to retain the tube in the fitting) and then I can try the
remaining two tubes and if they hum or not.

Anyone else noticed hum on LED replacement tubes? The only place I can
imagine it's coming from is any electronics in the (one?) 'active' end
cap and being amplified by the batten fitting?

Cheers, T i m