Careful with terminology ... a "xenon" bulb is not necessarily a "HID" bulb.
Halogen bulbs are filled with inert gas, of which xenon is one choice ...
If it looks exactly like a regular bulb and fits into the housing the same way and plugs in electrically the same way then it's a regular bulb, be it filled with xenon or otherwise. There are some high-performance variations such as Silverstar, etc., but I've never noticed any appreciable difference from a standard bulb (tried a set in my car ... once) and they tend to have a much shorter life. The bulbs that claim to be "HID look" generally are regular bulbs with a coloured housing which creates the bluish tinge by filtering OUT the yellow and red ... translation, they put out LESS light, then they may (or may not) run the filament hotter to compensate, which means they have a short life.
HID is a whole different ball game. HID will always require additional wiring and control modules and transformers - the kits come with this. The put out a lot more light than standard bulbs. The problem is that the light comes out of the bulb in a different way so that reflectors designed for standard bulbs don't control the light pattern as well, i.e. it MAY (and probably will) let out too much light above the low beam cutoff line, which blinds oncoming motorists. Some reflectors work tolerably with HID bulbs, others don't. The right way to do this is to use a projector-beam housing that is designed for use with an HID bulb. I've seen some that can be fitted into a standard reflector housing but you'll have to take your headlight housing apart to install them, and most of them are not designed to be taken apart, so this is not easy ...
