Luminaire body made of sheet steel profile, trapezoidal bent, white end faces made of polycarbonate, cable entries near the center of the luminaire, diffuser fastening by snapping in, direct diffuse light distribution by means of white-opal diffuser profile made of polycarbonate, convex with internal longitudinal prisms, attachable white end faces made of polycarbonate, UV-stabilized, electrical connection via 5-pin connection terminal with plug-in contact technology.