BMW have been fitting Angel Eye lights to some models for over 10 years now. They are simply light rings around the outside of the headlamp which can be switched on independently of the headlight itself. They replace the more conventional side lamp. Angel Eyes are sometimes known as Corona Rings too.
Until recently, BMW Angel Eye light rings have been illuminated using normal halogen headlamp bulbs. Each pair of rings requires a single bulb because the light is transmitted along a channel using a fiber optic type principle. Therefore, a pair of bulbs illuminates all four angel eyes.
More recently, BMW have moved with the times and have replaced the halogen illumination of the angel eyes to a brilliant bright white LED light source. These new LED angel eyes look much better than the old yellowish glow of the halogen illuminated rings. They are especially popular because they are a much better match for xenon headlights. Previously, owners of BMW with xenon lights had to put up with it.
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