I'm a cheap SOB.
Its only been very recently that prices on LED lightbulbs have come down to the point that I thought it worthwhile to start buying and using them. While I very much like the concept of a long life, low power consumption, cool running bulb, I discovered last night that there is a downside.
Also due to my cheap genes, I get TV via antenna rather than pay absurd amounts for cable or satellite. The last couple weeks, I've had unexplainable problems with Channel 2 (CBS here in Chicago) and 5 (NBC) has been shaky as well. If you know anything about broadcasting, you know that those channels are down in the low VHF band, and thus more subject to interference than the higher frequencies.
When I said unexplainable, I meant not the usual known problems. Channel 2 simply doesn't come in if Mrs. Maxx is playing her XBOX. Apparently they cut enough corners in design and components that it throws out spurious harmonics that disrupt the TV tuner on the low VHF channels. Driving a processor or power supply too hard can do that, and the XBOX does run pretty hot. Severe weather can do that as well. Weather has been bizarre recently, so I didn't look too hard for a cause.
Last night, though, Mrs. Maxx and I wanted to watch Hawaii 50, and Channel 2 was a pixel'd mess. Rotating the antenna didn't help. I got a new internet modem last week, so I tried turning that off to see if it was the problem. No change.
I was about to put it down to the neighbors getting some new, unknown, and malevolent RF generating device when the light bulb went on (pun intended) and I thought about the other electronic thing that had changed in the Maxx house.... a couple of LED bulbs in the man-cave track light. Went downstairs, turned that off, and Steve McGarret was good as gold.
Makes sense when you think about it.... cheap and dirty power supply in the lamp base to take the 120 VAC down to a usable DC voltage for the LED's. I don't have a scope, so I can't take one apart and look at the waveform, but I bet its filthy.
Funny when you think about it. All that AC infrastructure, and now a lot of our stuff is going back to DC. Edison vs. Westinghouse.