I guess thats why the back of the package says you should change them on a regular basis but man at 26 bucks a pop ouch if this one burns out or should i say when it burns out i will try the vision plus....I have tried the Silverstar bulbs in the past. The work great and really give you a lot more light. I even put them on my car. One drawback to them though, they burn out fast, you might want to carry a spare with you. I eventually switched to Philips Vision Plus bulbs, they are not as bright, but they haven't burned out, and I have had them in the car and the BMW for 4 years now. Since I'm not riding at night any more, I doubt I will spend money on super bright bulbs in the future for my bikes.