Ok, two days ago i was on my way out, and realized one of my headlights were out. I put silverstars in about 5 months ago? I went to the store and bought another two pack. Tonight im driving and realize the other one is out!!! Are then desined to blow out after certain usage? I just find it real weird that they both went two days apart. I usually always keep them on, even during the day. I think 35 dollars is alot for bulbs that last 5 months.