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. Direct/indirect light distribution, opal diffuser made of PMMA plastic with internal longitudinal prisms, creates a uniform, homogeneous appearance with ceiling illumination. Electrical connection using a fixed 5-pin quick-assembly plug with free phase preselection. Integrated guide aid for quick contact.