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I've found multiple questions that are similar to mine, but not quite the same.

I have multiple LED lights that occasionally flicker (maybe a few times an hour, for about 15 seconds). Not like a "trying to turn on and then turning off" kind of flicker, like a very visible 10Hz-ish-I'm-going-to-have-a-seizure kind of flicker. This happens to multiple lights: bathrooms, hallways on different sides of the house, dining room, and entryway. All told it's three different circuits. When the flicker happens, they all flicker. They otherwise work perfectly fine.

I cannot seem to connect the flickering to anything consistent: sometimes the heater is running, sometimes it's not. Sometimes the fridge is running, sometimes it's not. I tried replacing the light switches on a whim, but that changed nothing. These are all just dumb switches, by the way-- no dimmers or anything.

I don't really know what to investigate, here. My appliances appear to work without issue. My outlets appear to work without issue. I don't notice any flickering in the LED trim lights I put into my pot lights; it's possible those are too high on the vaulting ceiling for me to really notice, but that seems like a dumb explanation for why they don't seem to be flickering when honestly at least half the house seems to be. If I want to go to a rave, I'd like to do so by my own free will.

Update 1: every single one of these bulbs are new, from Home Depot. I recently purchased this house and went on a color temperature matching spree (we've all been there, right?). I just noticed that one of the bulbs in question, in a bathroom, is dead. That seems relevant.

Update 2: Scratch the previous update, that bulb was just loose. Between all of the flickering lights, the brand is the same. The entryway and dining lights use EcoSmart B11s, and the hallways and bathrooms use EcoSmart A19s.

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    Sounds like your lights might be responding to "Time of Use" or "off-peak" signaling from the power company. see diy.stackexchange.com/q/183596/18078 for one example. is the timing (clock time) consistent?
    – Ecnerwal
    Feb 4, 2021 at 2:08
  • See also en.wikipedia.org/wiki/Load_management
    – Ecnerwal
    Feb 4, 2021 at 2:19
  • You said there are 3 different circuits all combined, but can you on any one circuit remove everything involved in that circuit besides the suspect bulbs and see if it happens? Next, what brand are they - are they all the same brand? Last, what about where you live, is there any ham radio or other "higher" power RF things going on? Is this daily (maybe a neighbor)
    – noybman
    Feb 4, 2021 at 2:20
  • @Ecnerwal - yikes, our power supplier is switch mode power-supplying our 60Hz (or 50Hz) AC?!?! I'd go bonkers. They better pony up with some massive filter caps in those neighborhoods if thats the cause. Yuk.
    – noybman
    Feb 4, 2021 at 2:24
  • @Ecnerwal, no, the timing isn't consistent. It happened three times in about three minutes just now. There's no pattern as far as I can tell.
    – kyrofa
    Feb 4, 2021 at 2:40

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Try monitoring the voltage (nominally 120V) on both bus bars If one goes high while the other goes low the neutral connection between DB neutral bar and utility transformer is failing. Most LED lights seem to have a hard drop-out voltage so (on a positive note!) LED's are good indicators of incipient failure. Get the utility to look at it ASAP. a complete neutral failure can result in over-V reaching almost 240V to some 120V loads under certain conditions. We lost a refrigerator and several 24V control transformers (boiler controls, hot tub) in one such incident!

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