A lighting device, in particular for a motor vehicle, comprising at least one module having an optical axis O, each module comprising: a light source 8 configured to emit a light beam in an overall direction substantially intersecting the optical axis. A light orienting guide capable of directing the light beam emitted by said light source 8 substantially parallel to said optical axis O at the output of said guide and capable of forming a break in said beam. This device is characterized in that it comprises a single output portion of said light beam whose outlet surface 3 is continuous in curvature and which is common to all the modules.