Why do 120 vac home LED light bulbs flicker?

Bedroom #3 ceiling light fixture has 2 bulbs. After being on about 30 minutes they start to flicker. Both bulbs are 1100 Lumens and they don't flicker at the same time. They appear to go from 1100 to 900 lumens then 5 minutes later back to 1100. I checked wire nuts for back connection light still flicker. I swapped old bulbs for new 1500 lumens bulbs after 45 minutes they flicker, they appear to be 1500 lumen then 1300 lumen then 1500 again.

I learned to only have 1 bulb in each fixture and flicker rate changes, 1500 lumens to 1300 lumens then 5 minutes later back to 1500 lumens.

I thought it was a heat problem then I notice every time electric clothes dryer comes on some living room bulbs flicker but on other lights flicker. Living room bulb is 20 feet from clothes dryer it always flickers when the dryer comes on. When electric heat comes, living room and bedroom light flickers. When microwave comes on none of the kitchen lights flicker.

Relatives said there LED bulbs flicker also. Flicker is not noticed when TV is on because TV does more flicker than the LED bulbs.

I know sudden power surge can make the old incandescent bulbs have lumen dips.

LED bulbs seem to talk to each other 5 bulb bathroom fixture the bulbs take turns flickering. LOL

What else is going on that I don't know about?

Sounds strange. You may need an electrician to test your electrical grounds/wiring and your power needs.

How are you measuring the lumens?

alec_t said:

How are you measuring the lumens?

Click to expand...

Photograph light meter shows brightness dropped a little for a while then gets bright again. I tested 10 light bulbs they all flicker but 1, it did not flicker for several days, then it did.

When I turn the light on bulbs do not flicker for an hours or more then flicker becomes a regular rate.

I removed glass light fixture cover so I can see which 1 of the 2 blubs flicker. With cover removed flicker rate becomes slower. Remove 1 bulb and a single bulb flickers very slow. I found 1 bulb in the group of 10 that seldom flickers it has to be on all day to flicker.

From what I see it seems to me the circuit must be turning off a few of the LEDs when the bulb become too hotter.

I have 1 bulb that is about 2 years old after being on for about 30 minutes it turns completely off. After being off for a while the bulb comes on again. I put this bulb in the spare bathroom for people that are too lazy to turn the light off.

Have you tried different brands of bulbs? Also, some LED bulbs are labelled to not be used in fully enclosed fixtures (due to heat problems). Check your bulbs' fine print on the bulbs themselves. It could be you have a bad batch (or make) of bulbs
Can you check your AC voltage with a scope or something? Maybe there is an intermittent connection somewhere in the house wiring, which could show up as dips or spikes in the line voltage. An intermittent in house wiring could cause a fire eventually.

sagor1 said:

Maybe there is an intermittent connection somewhere in the house wiring, which could show up as dips or spikes in the line voltage. An intermittent in house wiring could cause a fire eventually.

Click to expand...

That would also be my main concern. The lights flickering may indicate a poor connection somewhere, which eventually will overheat and could lead to a fire.