BMW's have a replaceable bulb accessible from the back of the light housing. If it's another brand light, we need to know what make/model/year.
how to replace the headlight
On older vehicles you replace the entire headlight. On the newer vehicles you just replace the bulb unless the headlight assembly is damaged.
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How do you replace 2003 nissan maxima headlight?
Replace headlight bulb only when blown.
Steelheart
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Tōkidenshō Angel Eyes was created in 1996.