A luminaire (2a, 2b, 2c, 2d) comprising a housing with a first end surface (21), a second end surface (22), an at least partially circumferential surface (23) extending between the first end surface and the second end surface, a longitudinal direction (25) extending between the first end surface and the second end surface, and at least one connection device (3a, 3b; 3a′, 3b′; 3a″, 3b″) for connecting the luminaire to a complementary connection device (3b, 3a; 3b′, 3a′; 3b″, 3a″) of another corresponding luminaire, the at least one connection device being arranged on either of the first end surface and the second end surface of the luminaire, the connection device comprising an electrical connection element (34) extending in an angleγ with respect to said longitudinal direction (25) of said luminaire, said angle being comprised in the interval (0°; 90°].