I have a fan light fixture which I wired more than a year ago. It has three dimmable LED light bulbs on the bottom which recently started exhibiting strange behavior. Last week the lights started dimming and brightening on a regular cycle, roughly every 5 seconds. The lights will start our bright, gradually fade over a 5 second span, the instantaneously return to full brightness. I pulled off one of the bulbs and checked the voltage at the socket with a multimeter. it is cycling between 100 and 50 V in sync with the light bulb brightness. i.e. when the voltage drops to 50 v the lights are dim, then when the voltage jumps back up to 100 v the lights are bright. (on at 15 amp, 120 v circuit) I have never seen this kind of behavior before. I checked the voltage of another light on the same switch at the socket and it has a constant 120 v (no variability at all).
At first I thought this might be a overloaded circuit, but then I realized the other light is on the same circuit and is not having the voltage variations that this light fixture has. I thought this might be a loose neutral, but again I have another light fixture on the same switch which does not have this problem.
What is causing this? Its kinda annoying, but I don't know how to fix it.
At first I thought this might be a overloaded circuit, but then I realized the other light is on the same circuit and is not having the voltage variations that this light fixture has. I thought this might be a loose neutral, but again I have another light fixture on the same switch which does not have this problem.
What is causing this? Its kinda annoying, but I don't know how to fix it.
- TL;DR
- Light fixture with fluctuating voltage, on the same circuit as another light with constant votage. What is the cause?
