A luminaire (1) is disclosed comprising at least one optical chamber (10) delimited by a light exit window (11) and a curved reflective surface (15) extending from the light exit window to a mounting surface (17) extending from the curved reflective surface towards the light exit window. Each optical chamber comprises a light source (20) mounted on the mounting surface; and a light guide (30) extending across part of the optical chamber. The light guide comprises a total internal reflection major surface (40) facing the light exit window; a further major surface (50) facing the curved reflective surface, said further major surface comprising a light outcoupling portion (51) comprising a plurality of light outcoupling structures (53); a first edge surface (60) optically coupled to the light source; and a further edge surface (70) opposite the first edge surface arranged to direct light towards the curved reflective surface.