Flickering lights

If there is a duplex outlet for the gas dryer, I suggest plugging in something like a trouble lamp with an incandescent bulb. Them run the dryer and see if the bulb will flicker. If it does flicker then at least you know something real is happening.
 
Probably a motor somewhere. I've got a similar problem with a new light I put in one of the bathrooms. Not cheap, integrated LED light. It seems like it flickers ever so slightly when the furnace motor is running, Does it in when the A/C or forced air heat is on. I've not tried to troubleshoot it yet, but I think that's gonna be the culprit.
 
If the issue can't be replicated, you are still missing a contributing factor. Is there a curling iron, hair straightener, or some other large, cycling resistive load that the homeowner is forgetting was plugged into the bathroom circuit?
 
AC\DC said:
But how would any of that affect? An incandescent. That’s on a separate breaker. He would have to have a voltage drop across his whole system rhythmic like that to do what he saying… and then if he had that voltage drop, he be having other issues not just two light fixtures

He’s getting his information from the homeowner he can’t re-create it. Something’s fishy.
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Ya. It is a shot in the dark. I was trying to sort through electrical loads that would have a slower cycle. Or moving parts. Like the drum of a washer or dryer was knocking poor splices or something. The periodic lose connection would have a increased impedance and might dip voltage enough for the sensitive lights vs most other equipment wouldn't notice.

Like we have both said, it is almost impossible to narrow down without a power monitor.
 
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