Evening gentlemen...
In addition to lowering the electric bill, it also reduces the AMP load. Helpfull in older homes.
On the RF-Interferance Side... it can be an issue if you are trying to pull in very weak/distant transmissions.
FCC Interference Handbook
http://www.arrl.org/fcc/tvibook.html
Letter From an HF Newbie
http://www.arrl.org/news/features/2007/10/29/1/
http://www.fcc.gov/Bureaus/Engineeri...9/fcc99135.pdf
On April 1, 1998, the Commission adopted
...The lamp cannot meet the current FCC line-conducted emission limits for consumer RF lighting devices without the addition of filters which would significantly increase costs and would impede market acceptance. In 1995 the Commission granted GE a waiver to begin marketing the lamp under
relaxed line-conducted emissions limits in the 2.2-2.8 MHz band.8 In the Notice, the
Commission proposed to codify the relaxed line-conducted emission limits.
Other RFI sources:
http://www.rsgb.org/emc/pdfs/leaflet...ionmembers.pdf