How to Install Xenon HID Headlights in your Volvo
HID systems do not require a filament to make light, as 85,000 volt igniters take care of creating an electric arc between two ends where a filament would be in a normal bulb. so there are less components to stress. It does take 80-85 volts to keep the arc lit, which is not readily available in a normal 12V system of a Volvo. That is why there are other components to the system. It is not a mere bulb upgrade.