The present invention relates to a luminaire of elongated shape comprising an elongated mounting-plate (1) carrying internal functional components of the luminaire. The mounting-plate comprises at least one lampholder-supporting tongue (3) that is cut out in the mounting-plate by punching. The tongue remains integrally connected to the plate and is capable of undergoing rotation through 90° from an initial position to an in-use position about a bending axis (7) along which the tongue is connected to the plate. The mounting-plate also comprises an abutment (6), produced by stamping, which enables the rotation of the lampholder-supporting tongue to be limited to approximately 90°.