Why replace bulbs on first sign of failure? Also since this is PriusChat, if you have older D2R bulbs instead of the newer (2006+) D4R bulbs, your bulbs contain trace amounts of mercury in them and should be disposed of properly, not just thrown into the trash. Assuming you drive with both headlights on at the same time, you will want to replace both bulbs even though only one is showing the problem. But you need to replace your bulbs when this happens. It may buy you a couple days, a couple weeks, or months. If you flick them on and off enough, eventually it might get hot enough to jump the chamber and start the ignition process. When you are in this electrode length of starting and maybe not starting temperature plays a factor. However, a bit of charge remains and the salts might have just got zapped slightly warming them up along with all the bulb. Eventually the gap becomes too wide for the turn on surge to pass, and you have an open circuit, no juice flows, no light comes out. As it slowly erodes the gap between the cathode and anode increases slowly. This slowly erodes the electrode near the salt chamber (more on this later). They are subjected to high stress and voltages on startup. These bulbs do not have an easy life like halogens do. Most people attribute this to a vehicle problem with those "new fangled fancy lights". However, you may notice that you can turn them on and off a couple times in quick succession and it will work again. You may notice that your bulb doesn't "turn on" with the headlights. The quick answer is to replace them once they stop cold igniting. When the light goes out, the bulb needs to be changed. With halogens (oldschool bulbs that have been on and continue to be on cars for forever) it is quite simple. First off, how do you know when you need to replace your bulbs? So you are looking to replace your OE bulbs eh? This thread will have some basic information on High Intensity Discharge (HID) bulbs and why you shouldn't cheap out and should shop smartly and informed.
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