A controllable lighting system may include a plurality of light source groups, a group controller for each light source group, a master controller, and a network communication system. A coupling linkage for carrying out a relative movement of the surface bow with respect to the rear window frame is arranged between the rear window frame and the surface bow. The coating material dispensing device further includes a second component providing a nozzle through which the coating material is dispensed. The reading unit can perform a reading operation irrespective of the directions the unit is moved along the track. A weight fastener fastens a weight to the carrier.