The lifespan of our xenons is 2500- 2700 hours. If someone averaged 2500 hours of night driving and that figure excluded daytime/auto-light usage then the bulb could approach its end before 8 years. If there is no flicker it may have another few years or more left. Or if you can live with the yellow hughe and it doesn't obscure your night driving then get the most from them.
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