xenon headlights as bmw makes them use very high voltage (kV range) to discharge an arc through xenon gas atmosphere. that gives a very bright headlight, and huge light intensity. this is about $1200, plus labour, and i think you will need a different air cleaner box (the xenon units have transformers which stick out more than regular 12v headlights). this is rather invloved
the h7 bulbs called "xenon" or whatever give you marginally more light, what you notice is a different color from stock halogens, it is more blue. all halogens have a tungsten element which heats up and is kept in an atmosphere of a halogen gas, which composition varies (hence slightly different colors). the gas is not ionized, it serves mainly to protect the element from oxidizing, as it would in air in about 20 seconds.
those are cheapie $60 dollars a pair, from hella or piaa. if you go to higher wattage bulbs make sure they do not melt the wiring (around 100w maximum) imho i would not put 130 watts. all inall, this takes about 5 minutes and no tools.