Exterior helicopter light unit, comprising: a movable light head comprising a light source, a first motor and a second motor for actuating the movable light head, characterized in that the exterior helicopter light unit further comprises: an inverse differential gear assembly coupling the first and second motors (10, 20) to the movable light head in such a way that the first and second motors (10, 20) can tilt and rotate the movable light head in operation, wherein the inverse differential gear assembly comprises: a carrier structure, a first input gear and a second input gear, each rotatably coupled to the carrier structure, with the first motor being drivingly coupled to the first input gear and the second motor being drivingly coupled to the second input gear, and a connection structure, rotatably coupled to the carrier structure and coupling the first and second input gears (34, 36) to each other, with the movable light head being in a rotation transmission relationship with the connection structure, wherein the carrier structure, the first and second input gears (34, 36), and the connection structure are coupled in such a way that a rotation of the first and second input gears (34, 36) in the same direction results in a rotation of the carrier structure, tilting the movable light head, and a rotation of the first and second input gears (34, 36) in opposite directions results in a rotation of the connection structure, rotating the movable light head. a movable light head comprising a light source, a first motor and a second motor for actuating the movable light head, characterized in that the exterior helicopter light unit further comprises: an inverse differential gear assembly coupling the first and second motors (10, 20) to the movable light head in such a way that the first and second motors (10, 20) can tilt and rotate the movable light head in operation, wherein the inverse differential gear assembly comprises: a carrier structure, a first input gear and a second input gear, each rotatably coupled to the carrier structure, with the first motor being drivingly coupled to the first input gear and the second motor being drivingly coupled to the second input gear, and a connection structure, rotatably coupled to the carrier structure and coupling the first and second input gears (34, 36) to each other, with the movable light head being in a rotation transmission relationship with the connection structure, wherein the carrier structure, the first and second input gears (34, 36), and the connection structure are coupled in such a way that a rotation of the first and second input gears (34, 36) in the same direction results in a rotation of the carrier structure, tilting the movable light head, and a rotation of the first and second input gears (34, 36) in opposite directions results in a rotation of the connection structure, rotating the movable light head. an inverse differential gear assembly coupling the first and second motors (10, 20) to the movable light head in such a way that the first and second motors (10, 20) can tilt and rotate the movable light head in operation, wherein the inverse differential gear assembly comprises: a carrier structure, a first input gear and a second input gear, each rotatably coupled to the carrier structure, with the first motor being drivingly coupled to the first input gear and the second motor being drivingly coupled to the second input gear, and a connection structure, rotatably coupled to the carrier structure and coupling the first and second input gears (34, 36) to each other, with the movable light head being in a rotation transmission relationship with the connection structure, wherein the carrier structure, the first and second input gears (34, 36), and the connection structure are coupled in such a way that a rotation of the first and second input gears (34, 36) in the same direction results in a rotation of the carrier structure, tilting the movable light head, and a rotation of the first and second input gears (34, 36) in opposite directions results in a rotation of the connection structure, rotating the movable light head. a carrier structure, a first input gear and a second input gear, each rotatably coupled to the carrier structure, with the first motor being drivingly coupled to the first input gear and the second motor being drivingly coupled to the second input gear, and a connection structure, rotatably coupled to the carrier structure and coupling the first and second input gears (34, 36) to each other, with the movable light head being in a rotation transmission relationship with the connection structure, wherein the carrier structure, the first and second input gears (34, 36), and the connection structure are coupled in such a way that a rotation of the first and second input gears (34, 36) in the same direction results in a rotation of the carrier structure, tilting the movable light head, and a rotation of the first and second input gears (34, 36) in opposite directions results in a rotation of the connection structure, rotating the movable light head. a rotation of the first and second input gears (34, 36) in the same direction results in a rotation of the carrier structure, tilting the movable light head, and a rotation of the first and second input gears (34, 36) in opposite directions results in a rotation of the connection structure, rotating the movable light head.