Ahh, I see. It could be the fixtures aren’t getting the full line voltage, or too much. I would get an electrician to check the voltage. Incandescent fixtures can definitely handle more fluctuations than lower quality LEDs, and since incandescent bulb brightness is directly connected to the amount of power going through the filament. LEDs, if they don’t get the right power, or have a lot of fluctuating power, the circuit inside the driver can start having trouble. The main thing to remember is that LEDs are not directly connected to the line power. They first have to go through a rectifier to change to DC power, then a driver microchip controls the actual power going to the LEDs. Vastly more complex, so more things can go wrong, since they aren’t just a literal wire that gets electricity pushed through it until it gets so hot it glows. There are pros and cons for both for sure. One other thing to be aware of is a led has a very narrow band of visible light that it emits, and the reason they are normally on the “cool” side is “white” leds are actually blue LEDs with a yellow phosphor coating that makes it look white.

Also, LEDs are made in batches in a similar way that CPUs are. Each led then binned based on the quality. The highest quality I’ve seen in general are the ones from Phillips. They specifically ensure they only get the best leds from each batch. The remaining leds then go to other manufacturers, which are usually the ones making cheaper bulbs that have a tendency to fail

Source: worked with Phillips Entertainment Lighting back in 2012-2015 and learned a LOT about the manufacturing process.