HID and Capacitor are the same term for your xenon bulbs support sobi. You stated in previous post that your fog HID still having problem after installed capacitors. I experienced the same problem before but i didn't install capacitors, i just don't turn the light on short after starting the engine and it works fine. It's great that your problem was gone.

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BMW X5 2004 - 2005 MB E320
BMW 1999 528i/ 1998 Nissan PathFinder (sold)