No No - when I mentioned changing places - I'm talking about the brands at
an arbitrary time in the future, should the same experiment be run at
another time in the future - using new fixtures at the time *(not the ones
you have now)* I would not expect the noisy one to fix itself, and I
wouldn't expect the quiet one to become noisy out of the blue.
sorry if I was unclear.

"News Features" wrote in message
...

"Hal Rosser" wrote in message
...
--I expect the ballast is the critical component - some are magnetic,
some are electronic - its probably the culprit

Hello, Hal.

I suspected the electronic ballast in the "bad" light myself. They both
use electronic ballasts. Perhaps it's an unfiltered ballast in the "bad"
light or something like that. They both are supposedly made in the USofA
so I can't blame it on the Chinese tendency to eliminate unnecessary items
like filter capacitors to save 18 cents of the cost.

I hope you're wrong about the two lights switching places; somehow, I
can't imagine the "bad" light gradually becoming RFI-quiet over time... by
what mechanism could that happen?

I am judging the lights as they are... one is noisy, the other is quiet.
It is somewhat amazing that we are trying to make excuses for this
situation rather than accept that some lights are noisy and some are
quiet! :^)