Device carrier made of galvanized, profiled sheet steel, surface coated with polyester resin. Tool-free fastening with integrated side lever locks for quick insertion into the support rail. LED unit in housing length for an optically continuous light strip. Light distribution direct/indirect beam, opal diffuser made of PMMA plastic with internal longitudinal prisms, creates a uniform, homogeneous appearance with ceiling illumination. Heat-resistant cables including fixed 3-pin quick-assembly plug with tool-free phase preselection and search finger.