I got a year out of mine, that is before I crashed the car and smashed both of them. I have no reason to believe that they would not have gone much longer. I loved them. When I get enough money I’ll def buy the new ones.
Just a Suggestion, If your having problems with durration of life, you should check you connections. In the socket specifically. Also check the Lense for leakage. “A wet bulb is a sad bulb.” - how lame does that sound? lol