A luminaire (1) comprising a one-piece, transparent, tubular housing (3) with an annular wall (5). Said housing comprising an elongated light emission window (9), a reflector area (11) inside the housing and adjacent the light emission window, an electrical contacting support (13) inside the housing and remote from the light emission window, and two open ends. Elongate reflectors (21) extend towards the electrical support in a direction transverse to the axis. Two end parts (53) close the tubular housing (3) as each end part is provided at a respective open end and is electrically connected to a respective electrical contact. The lamp (17), together with the electrical contacts, can be replaced in the housing without the necessity to remove the reflectors as well.