I bought an HID retrofit kit one time on ebay for like $40. They looked awesome for about 10 seconds, then as soon as they're warmed up they flicker like a candle. You get insane headaches trying to focus and drive at night with both lights flickering non stop. I tried all the nonsense kits to rewire and give more direct power from the battery to the HID ballast etc, I even tried using capacitors to stop the flickering, but NOTHING helped at all. Apparently a lot of cheaply made ballasts will do that, they flicker after warm up because of a poorly designed power supply.