You are sitting in your car at a traffic light late at night and see a Cadillac CTS-V drive by. The first thing you notice is the bright whitish-blue light that is emitted by the headlights of the CTS-V. The CTS-V is equipped with an HID headlight lighting system, as are many high-end cars today, which put off a much brighter light than your standard halogen light bulbs.
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