12000k xenon car lights

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I'm trying to digest that article on Xenon bulbs.
The ones they tested were long-arc bulbs which according to Wikipedia are "frequently used to simulate sunlight". The bulbs they used were 4500w and 10,000w.

Headlights are short-arc and more from Wikipedia

Xenon short-arc lamps are low-voltage, high-current, DC devices with a negative temperature coefficient. They require a high voltage pulse in the 50 kV range to start the lamp, and require extremely well regulated dc as the power source. They are also inherently unstable, prone to phenomena such as plasma oscillation and thermal runaway. Because of these characteristics, xenon short-arc lamps require a sophisticated power supply to achieve stable, long-life operation.