Correct answer
They can improve illumination and facilitate night vision.
They can improve road illumination and facilitate night vision. The benefit depends on system design, condition and adjustment; it does not guarantee freedom from glare or eliminate fatigue. Follow the vehicle requirements and do not fit a xenon lamp in a headlight designed for another technology without the corresponding approval.
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They can improve illumination and facilitate night vision.
They always illuminate worse, even when correctly adjusted.
They guarantee the driver will never experience fatigue.
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