HID bulbs do indeed degrade over time. Imo you have two options. If you are looking for max output and you don't mind a little yellow in your light go with osram night breakers. If you want a pure white light without loosing any output over an oem set go osram cbi.
Make sure you buy from a legitimate source as there are a lot of fakes out there. Good luck!
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2020 F90 M5 Comp Oxford Green Metallic II-Aragon JOURNAL
2016 F10 M5 Space Gray-Black SOLD
2012 E70 X5M Monte Carlo Blue-Silverstone SOLD
2001 E46 M3 Oxford Green Metallic II-Cinnamon SOLD
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