Method of manufacture of an automotive light comprising the steps of: - providing a container body delimited by a first perimetral profile, - providing a lenticular body, internally delimited by a second perimetral profile and externally by an outer edge corresponding to said second perimetral profile, - mutually associating at least partially the respective first and second perimetral profiles (20, 28) of the container body and of the lenticular body, the contact surface between said perimetral profiles (20, 28) defining a welding interface which extends along a curve defined by a curvilinear abscissa, - providing at least one laser emitting device which emits a light beam or radiation having a characteristic emission spectrum, characterized in that it comprises the steps of: - providing a plurality of fibres which receive portions of the laser beam from the laser emitting device and direct them towards the welding interface through the lenticular body, wherein the container body acts as an absorbing element towards the light beam and the lenticular body acts as a transmissive element of the light beam, - providing optical devices for changing the divergence of the portions of laser beams outgoing from the fibres, so as to collimate them overall along at least one predetermined optical axis (X-X), - identifying at least one discontinuity on the outer edge of the lenticular body, - directing on a critical portion of the welding interface at least a first laser beam emitted by a respective fibre lying on an optical plane incident with said critical portion of the welding interface, - wherein said critical portion is the portion of welding interface corresponding, i.e. aligned, in a direction perpendicular to said welding interface, with said discontinuity, - wherein said discontinuity constitutes a change in the distance between the outer edge and the welding interface, wherein the optical plane identifies an angle of orientation (α) between 0 and 45 degrees with a plane tangent to the critical portion of the welding interface. - providing a container body delimited by a first perimetral profile, - providing a lenticular body, internally delimited by a second perimetral profile and externally by an outer edge corresponding to said second perimetral profile, - mutually associating at least partially the respective first and second perimetral profiles (20, 28) of the container body and of the lenticular body, the contact surface between said perimetral profiles (20, 28) defining a welding interface which extends along a curve defined by a curvilinear abscissa, - providing at least one laser emitting device which emits a light beam or radiation having a characteristic emission spectrum, - providing a plurality of fibres which receive portions of the laser beam from the laser emitting device and direct them towards the welding interface through the lenticular body, wherein the container body acts as an absorbing element towards the light beam and the lenticular body acts as a transmissive element of the light beam, - providing optical devices for changing the divergence of the portions of laser beams outgoing from the fibres, so as to collimate them overall along at least one predetermined optical axis (X-X), - identifying at least one discontinuity on the outer edge of the lenticular body, - directing on a critical portion of the welding interface at least a first laser beam emitted by a respective fibre lying on an optical plane incident with said critical portion of the welding interface, - wherein said critical portion is the portion of welding interface corresponding, i.e. aligned, in a direction perpendicular to said welding interface, with said discontinuity, - wherein said discontinuity constitutes a change in the distance between the outer edge and the welding interface, wherein the optical plane identifies an angle of orientation (α) between 0 and 45 degrees with a plane tangent to the critical portion of the welding interface.