Abstract: A combined fixture and cooling device for the mounting and cooling of fluorescent tubes and made by extrusion of a heat conductive material so as to constitute a cooling tube having an upper wall, a pair of side walls and a concave, part-cylindrical lower wall defining a contact face for the upper surface of a fluorescent tube, the side walls of the cooling tube being provided with lengthwise extending ribs or grooves to provide fastening means for mounting the fluorescent tube on the cooling tube with its upper surface in contact with the contact face of the cooling tube.The fluorescent tube is mounted in sockets associated with cylindrical casings of the same diameter as the fluorescent tubes and including ballast means for the fluorescent tubes, and the cylindrical casings are mounted on the cooling tube by means of spring clips embracing the lower part of the casings and engaging the ribs or grooves of the side walls of the cooling tube.