Described herein are OLED lighting systems and devices, and methods related to fabricating such OLED lighting systems and devices. The methods can be used to produce OLED systems and devices of varying sizes without changing the underlying OLED unit design. In one embodiment, the OLED lighting system includes a cover that connects a plurality of OLED lighting units. The cover includes contacts that are accessible from outside the system, such that each OLED lighting unit connected to the cover can be controlled in series or in parallel.