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Originally Posted by AzNMpower32
Xenons have a projector bulb while the halogens had a multi-reflector (no bulb) design on the pre-'04 facelift models. Starting in '04, all of the X5s came with projector bulbs, but the xenons have something like "Dynamic Xenon" inscribed on the bulb. Also, there should be a tiny green LED circle next to the Auto headlight setting on the headlight switch.
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I have an '04 Feb. build X5 with Bi-Xenon without "Dynamic Xenon" inscribe on the bulb, that also does NOT have the tiny green LED next to the Auto headlight setting (the Auto headlight setting is present, but just no green LED). So, it's hard to tell for the '04 model. The only simple way to tell is to turn on the headlights in auto mode and see if they do a self-level diagnostic adjustment. Halogens do NOT have the self-leveling feature.