How often do you need to change headlight bulbs

As soon as the first one burns out, replace the pair.

Plastic housing yellowing from UV, and dirty windshield probably has more to do with it than the bulbs themselves.

 

I had my first lightbulb go out in December 2012. They didn't have a pair of bulbs in stock at my local mechanic, so they just replaced the burnt out bulb. Less than 2 months later (today), I'm back at the mechanic's to have the second one replaced.

It seems that my original set of bulbs had a somewhat short life. I don't use them as Daytime Running Lights, so it seems odd (maybe normal.....I guess I thought they would last longer).

 

Do you have the LED headlights, or?

 

Regular halogens.