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Gruffydd3,
The above information is a good start, but there is more to HID vs. Halogen. Like stated earlier, HID bulbs arc several thousand volts (18,000+) from what I remember across two prongs, but the Gaseous mixture isn't the only component to a HID bulb. If you look at one carefully, you will see a greenish to tan colored mixture in the bulb. That is the Mercury Halide Salt mixture that contributes to the color of the light output. HID bulbs use a 90 volt box to help with its startup as well. Xenon is used in some halogen bulbs due to its ability to burn cooler, it also helps extend the lifespan somewhat as well. Xenon atoms are bigger than Bromine( A typical gas used in bulbs) and this helps to keep the vaporized Tungsten atoms off of the glass envelope, and deposit them back to the filament.
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