Are these 9004 bulbs (not HID) that are filled with Xenon (instead of Halogen). Truely better than standard Halogen bulbs? OR do they just use a higher wattage fillament? (55 vs 35watts). Who has tried them? If they are higher wattage are they going to endanger my wiring etc? This is for a 1995 Jetta GLX (single bulb not like the GTI). Andy Atwell