5.31 Lamps installed on a vehicle which is approved according to this Regulation and approved for one or more replaceable light source categories according to Regulations Nos. 37, 99 or 128, shall be fitted with light sources approved according to these light source categories only.
This requirement does not concern light source modules, LED modules and non-replaceable light sources, except for when they are required to be approved by the applicable Regulation.
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