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Posts Tagged: HID headlight bulb

HID headlight bulb

HID headlight bulb — what the letters and number mean HID bulb designations 1st position: HID bulbs are “discharge” bulbs so the first letter is always a D. 2nd position: Designates the series; 1, 2, 3, or 4 (more on that later) 3rd position: “R” or “S” denotes whether the bulb is designed for use in a reflector style housing or a projector style housing. A bulb for a reflector style housing has an opaque shield that masks off a portion of the light to match a reflector style headlight’s … Read More


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