Illumination device, comprising the following components: - a mounting base having a mounting interface for mounting on the underground and a base mounting interface for mounting a lamp support (15a, 15b), - a first lamp support having a support mounting interface for mounting on the associated base mounting interface and comprising a single support coupling interface for coupling to a lamp unit (39a, b), - a second lamp support having a support mounting interface for mounting on the associated base mounting interface and comprising a plurality of support coupling interfaces for coupling to a plurality of lamp units (39a-d), wherein optionally the first or the second lamp support (15a, 15b) can be or is mounted on the mounting base via the mutually assigned mounting interfaces (14, 36), - a plurality of lamp units (39a-d), each of which comprises a lamp housing and a plurality of illumination means accommodated in the lamp housing, wherein the lamp housing comprises a housing coupling interface, via which the lamp unit (39a-d) can be coupled to the associated support coupling interface with the lamp support (15a, 15b), wherein optionally an individual lamp unit (39a, b) can be or is coupled to the first lamp support via the mutually assigned coupling interfaces (38, 53) or one or more lamp units (39a-d) can be or are coupled to the second lamp support via the mutually assigned coupling interfaces (38, 53), wherein at least one of the lamp units (39a-d) can be or is pivotably mounted on the associated lamp support (15a, 15b) via pivot bearing means, wherein the pivot bearing means are parts of the mutually assigned support coupling interface of the respective lamp support (15a, 15b) and the housing coupling interface of the lamp housing of the lamp unit (39a-d), and wherein the pivot bearing means comprise a pin-type pivot axis body and a pivot axis body receptacle in which the pivot axis body can be or is pivotably mounted, characterised in that the pivot bearing means comprise adjusting means for adjusting the pivot angle of the lamp unit (39a-d) relative to the associated lamp support (15a, 15b). - a mounting base having a mounting interface for mounting on the underground and a base mounting interface for mounting a lamp support (15a, 15b), - a first lamp support having a support mounting interface for mounting on the associated base mounting interface and comprising a single support coupling interface for coupling to a lamp unit (39a, b), - a second lamp support having a support mounting interface for mounting on the associated base mounting interface and comprising a plurality of support coupling interfaces for coupling to a plurality of lamp units (39a-d), wherein optionally the first or the second lamp support (15a, 15b) can be or is mounted on the mounting base via the mutually assigned mounting interfaces (14, 36), - a plurality of lamp units (39a-d), each of which comprises a lamp housing and a plurality of illumination means accommodated in the lamp housing, wherein the lamp housing comprises a housing coupling interface, via which the lamp unit (39a-d) can be coupled to the associated support coupling interface with the lamp support (15a, 15b), wherein optionally an individual lamp unit (39a, b) can be or is coupled to the first lamp support via the mutually assigned coupling interfaces (38, 53) or one or more lamp units (39a-d) can be or are coupled to the second lamp support via the mutually assigned coupling interfaces (38, 53), wherein at least one of the lamp units (39a-d) can be or is pivotably mounted on the associated lamp support (15a, 15b) via pivot bearing means, wherein the pivot bearing means are parts of the mutually assigned support coupling interface of the respective lamp support (15a, 15b) and the housing coupling interface of the lamp housing of the lamp unit (39a-d), and wherein the pivot bearing means comprise a pin-type pivot axis body and a pivot axis body receptacle in which the pivot axis body can be or is pivotably mounted, characterised in that the pivot bearing means comprise adjusting means for adjusting the pivot angle of the lamp unit (39a-d) relative to the associated lamp support (15a, 15b).