Abstract: An outer cabin semi-truck light system that illuminates its trailer when the semi-truck moves backwards. The system is made of a pair of retractable light mounts and each retractable light mount has a truck light mount that is attached to each lateral side of a semi-truck cabin, a light enclosure that is attached to the truck light mount via light enclosure pivot that is connected to a first servomotor, and a light source that is placed on a light source pivot that is connected to a second servomotor, the light source is housed within the light enclosure. And, a controller that connects and controls the rotation of the servomotors of the system. The lights of the system are manipulated to light the rear of a trailer being hauled by the operator of a vehicle when he or she is backing the trailer in low-light conditions.