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kwang125 said:
D2R xenon bulb is for headlight house without projector.
D2S bulb is for projector headlight.

AFAIK, Mercedes/Lexus/Acura xenon headlight don't have projectors.

Yup, he is right

D2S is for headlights with projectors
D2R is for headlights with reflective housing (ie your halogen based headlight assemblies)
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