Road safety - ксенон burners have a limited продолжительность жизни, burnout of one means that the other will soon fail.
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Improving visibility - ксенон burners emit less light over time, only the equal stream from both headlights will ensure optimal and even illumination of the road.
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Comfort of driving at night - the light of xenon burners changes color over time. Only the same color of the beam from both headlamps guarantees the correct recognition of road details.