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What's the difference between D2S, D2R, and D2C?
D2 and D1 refers to the bulb base type. S stands for Shielded which is used on projector headlights. R stands for Reflector and requires a ceramic strip or metal shield to control light output. C refers to Color and generally means anything above 5000K temperature. The D2C bulb is aftermarket and will fit any D2S and D2R housing. D3S and D4S are Non-Mercury filled bulbs and are currently limited to a few specialty vehicles and some Toyota/Lexus models."