The halogen lamp in the bi-xenon cluster has 2 functions,
1) its used when you flash your headlights by pulling the indicator stalk towards you, and in this case the xenon remains off. Xenons do not like being turned on / off for short periods and take a while to warm up to temperature and provide full light, far longer than a quick flash.
2) it supplements the main beam when in use, although most of the main beam light is xenon.
Any H7 bulb should the bill as a replacement.
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Manny
2004 A4 1.8T Sport Cabriolet, 89K Miles
Past
2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly
with retrofit AMI and DVB-T in place of Analogue
2003 Volvo S60 D5 SE Manual, 197K miles.
2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles
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