I know that there are other threads looking at power line noise and the use of quality outlets, power cords, conditioners, etc to mitigate. However, we also should consider the common things that we do in our home which may add electrical noise.
With the new government phase out of many incandescent light bulbs the alternative is CFL, LED and halogen. Over the past several years I have been swapping out my incandescent bulbs with these types. More recently I have started using LED as non-name brand have come available at almost affordable prices.
There are a few places around the house where they seem like they would be ideal. One is my outside lights, which burn all night. I have also had issues with incandescent filaments breaking easily on any windy day. They have worked out great, though I did just have an LED bulb go bad after 6 months of service.
Another seemingly ideal application was my garage door opener. Again, even with heavy duty bulbs, I get broken filaments. I tried CFL but on cold days they take too long to brighten. Then I tried an LED as they brighten instantly. Then I started having trouble with the remote. At first the light bulb change didnt occur to me as I thought the CFL would have been the noisy one. However, I replaced the LED with an incandescent bulb and all was good.
After a little research, I found that the power converters in the bulbs can be a great source of EMI as they use pulse power supplies to regulate power while reducing heat. Of course these power supplies are inherently noisy. Cheap no-name bulbs, even though they are stamped with the FCC approval, tend to have inadequate EMI filtering compared to name brands like Philips and Sylvania. You can find test to demonstrate all over the internet.
Ideally, there should be a central power supply to convert to DC and provide good EMI filtering rather than all these individual power supplied which dont have the space available for proper filtering or compromises are made to reduce cost. Since these LED bulbs are commonly being retro-fitted into systems designed for incandescent bulbs, where not much care is needed, it will be interesting to see how EMI issues develop when more and more noisy (cheap) LED bulbs interact when they are installed in a common system.
Bottom line, be careful where you use LED bulbs and the quality of bulb that you choose.