[RFI] How do I know if LED bulbs are noisy?

[Eric Rosenberg <ericrosenberg.dc@gmail.com>]

This may be a very naive question...

I just replaced 6 CFLs in the basement (within 15 of the shack) with GE 
LED bulbs.
I can't tell whether the environment has gotten any worse... the noise 
level in this old (80+ years) house surrounded by crumbling urban 
infrastructure.
Is there a distinctive sound I should listen for? I'll poke around while 
an HT, but what am I looking for?
I'm not ready to kill the power and go through the house for a 
one-by-one circuit audit.
Thanks & 73,
Eric W3DQ
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