XC70 AWD L6-3.2L VIN 98 B6324S (2009)
Headlamp Control Module: Description and Operation
Bi-Xenon headlamp system
Bi-Xenon, a headlamp system with moveable reflector, is based on gas discharge technology. The system combines high and low beam into the same
Due to legal requirements (regarding low beam) for this type of lamp, the vehicle must be equipped with automatic headlamp levelling.
Xenon vs. Halogen
higher color temperature, which produces a whiter light
better reflection of road signs and road markings
lower power consumption (approx. 65% lower).
Good to know:
Daylight has a color temperature of about 5000 °K. The closer to natural light, the less strain on the eyes. Standard H4 bulb: 3200 °K. Volvo's gas
discharge bulb: about 4200 °K.
With the Bi-Xenon system, high and low beam generates the same light color. The human eye thus has an easier time adjusting to switches
between high and low beam.