Lighting device with a light-source module having two emitting surfaces

The device has a light source module (3) including a light transmitting face (15) and another light transmitting face (16). A light reflector (14) includes a light reflecting surface placed to face a portion of the former light transmitting face, so as to cover the portion of the former light transmitting face, where the dimensions of the light reflecting surface are smaller than the dimensions of the former light transmitting face. The light source module includes light sources e.g. organic LEDs, and a light guide surface co-operating with the light sources.