I have all LED bulbs in my house, the nice CREE models that look like this. They've all been great, except for the ones I put in my bathroom's four-bulb fixture. One by one, all the bulbs in this fixture–and only this fixture–have been dying. They were purchased at different times so it's probably not a package of lemons that's to blame. What happens is that while the lights are on, every once in a while there is a very brief intermittent flicker. The flicker gradually gets longer until a bulb dies and its LEDs will only produce very, very dim light, even when put in another fixture whose bulb works fine.
I suspect that something it wrong with the fixture itself or its wiring. What could it be?
Here is a picture of the fixture. Only one bulb remains, and I suspect that it will burn out soon, too.
And here's a photo of the base of the dead bulbs:
Best Answer
Are there any signs of burning on the base of the bulb when you take them out? I wonder if the bulbs are not seating fully in the fixture (due to the shape of the bulbs and glass shades) and you are getting some arcing in the socket that eventually ruins the contacts.
Another thing to look at is to verify that your bulbs are approved for damp locations. It looks like most of the current Cree bulbs are but you seem to have an older model (?). If there is a shower in this room perhaps the moisture is working its way into the bulbs over time.
My final thought is to look at is the voltage at the sockets, if you have a multimeter. Is it considerably higher than the rest of the house? Anything over 125V is probably excessive. Or do these lights share a circuit with a refrigerator or something that might cause a voltage spike when the compressor turns off?