One thing, best tagged as "practical" happened last week. One of my xenon headlights started to change color from white to pink/red and the light intensity got lower. That is usually a sign of soon death. But not always you can change it immediately for various reasons. (weekend, no time slot in the service, no bulbs on stock etc). In my case I noticed it one evening and the next day in the early morning I had to drive 330km to other city.
So how long it lasted ? From being absolutely sure the light changed from white to pink, it took around 5-6 hours of functioning / drive to the definitive end.
When I came to the service (in the other city - Prague) the headlamp lighted somehow. After restarting the engine for going into the service garage it was dead. Good timing.
The service work was about 30 minutes : changing for Philips D2S, setting up & calibration. It is recommended to change both headlights because they have to have the same color and intensity of the light. Life expectation : 2400 hours. It happened after 4 years and 85.000 km of the Saab 9-3 convertible.
So advice : if your xenon lights are changing color, go to change them as soon as possible. You don't have too much time.
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