[RFI] Noise changes when room lights turn on / off

[KD7JYK DM09]

: The only lights that could GENERATE noise are fluorescents or those that
: have a DC power supply.  It's become quite common for most track
: lighting to use a DC power supply, and they are virtually all switching
: power supplies.

An incandescent with a cracked, but not broken filament, as well as a heat 
shield that has dropped and is arcing on the power leads/supports will sound 
terrible.

Kurt