Lamp module causes noise??

I finally got my Elk Meter and realized that I had virtually no signal
in my living room/den circuit, with a substantial amount of noise. I
finally traced it to a brand new Radio Shack branded lamp module. I
replaced it with a Radio Shack branded appliance module, and now the
signal is strong and the noise is gone! Is this normal? Aren't most
modules the same just branded differently?

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