My lights are white and I don't think it's the bulb when it comes on it's fine and stays like that for days, then all of a sudden it decides to not come on and when that happens the fog lights come on. I am sure that the fog lights are programmed to come on if a head light fails as a safety (German engineering is top notch).

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2006 X5 4.8is Titanium Silver / Black (36K miles)
Dinan Cold Air Intake, Software, Exhaust
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1996 M3 Sedan Artic Silver / Dove Grey (65K miles)
Dinan Stage III Super Charger, Software, Throttle Body
Short springs on Koni Gas Adjustable
Borla Exhaust