I just got a reply back from Kensun on my issue of the LED headlight bulbs pulsing and strobing when turned off. They were very nice and quick to send them out. Hopefully it works. If it works, I'll probably by a couple sets (Fog, High Beam, and Low Beam) for the car from them. That was good customer service from them.
They didn't even ask for a picture of what it is doing or even argue with me about the install or anything.
They are sending me some resistors (i suspect they are the same kind, aluminum wound, that I put on my flashback LED's turn signals to stop them from rapid flashing) to put on the bulbs. They did say they get hot.
So it sounds like it is a discharge issue of an internal capacitor.
I've also read that some computer systems on cars send small voltage signals at low current to the LED's to check to see if they are still on, and that could cause the flashing/strobing/pulsing when turned off. But that's in newer cars. Mine is 10 years old now.
As far as inside house bulbs doing that, I've never noticed it before. I have noticed bulbs only lasting a year or so, when they are suppose to last like 12 years.
Before they die, they are random as far as turning on when you hit the light switch. Sometimes they don't work at all, sometimes they do. This goes on for a few weeks before they completely die. Maybe it's the brand, cheap Home Depot ones.