VEHICLE LIGHT FIXTURE SYSTEM, LIGHT DISTRIBUTION CONTROL DEVICE, AND LIGHT DISTRIBUTION CONTROL METHOD

A vehicle light fixture system (1) includes: a low-beam unit (2) adapted to form a low-beam light distribution pattern (P5) having a cutoff line (CL) and to independently adjust illuminance in a plurality of subareas (P3) in the low-beam light distribution pattern (P5) arranged below and along the cutoff line (CL); and a light distribution control device (8) that controls the low-beam unit (2) to form a first reduced illuminance portion (46) in, of the plurality of subareas (P3), the subarea (P3) having a position in a vehicle width direction overlapping a position of a vehicle in front (100) in the vehicle width direction.