i bought some "xenon" bulbs off ebay back when i first got my 9-3, I wanted something with a bright white/blue hue to it. Threw them in, looked cool but it did dim the light output actually, cuz the bulbs actually just have a blue film over the bulb itself. After having the bulbs in for 6mos, i finaly ordered an HID kit, will never go back now. HID is ultimately the way to go if your looking to upgrade bulbs imo.