An optical unit (BO) is suitable for fitting a vehicle and comprises first and second lighting devices capable of delivering photons, a first reflector (R1) capable of transferring photons delivered by the first lighting device to a face A second reflector (R2) placed in front of a selected part of the first reflector (R1) and capable of transferring photons delivered by the second illumination device to the front face, and a support plate placed above the first R1) and second (R2) reflectors and comprising an internal face on which are fastened sources of the first and second lighting devices at selected points.
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