Yes, HID capsules, as they age give out less lumens. I replaced the ones on my S8, as they seemed dim compared to one of my previous cars, an S4. My '98 S8 was also noticeably brighter.
Cost me £19-ish of eBay, and the difference in lumen output is like night and day.
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2006 Audi A8 D3 Quattro Sport 4.2 TDI - Silver, Family Oil Burner.
2000 Audi A4 Quattro Sport 2.5 TDI - Santorin Blue, S8-Powered DTM Race Car Build In Progress.
2000 Audi A4 Quattro Sport 2.8 30V - Pelican Blue, RS4 Widebody, D3 4.2 01E, High-Spec B5 Build In Progress.
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