A light module for a headlight, in particular a motor vehicle headlight, wherein the light module comprises: -) one or more light sources, which is/ are arranged on a light source carrier, -) at least one auxiliary optical unit, wherein said at least one auxiliary optical unit can be fastened on the light source carrier by means of an auxiliary optical unit carrier such that the light sources, the light source carrier, the at least one auxiliary optical unit, and the auxiliary optical unit carrier form a light source assembly, -) a secondary optical unit, which is arranged behind the at least one auxiliary optical unit, in the light exit direction, and is held by a secondary optical unit carrier, -) and wherein, in addition, an assembly carrier is provided, relative to which the light source assembly can be fastened, -) and wherein clamping means are provided, by means of which the light source assembly can be detachably clamped between the secondary optical unit carrier and the assembly carrier, -) and wherein, in the detached state of the clamping means, the light source assembly is displaceable substantially parallel to the assembly carrier, -) and wherein the clamping means comprise at least one clamping screw, by means of which the assembly carrier and the secondary optical unit carrier can be directly connected to one another such that the at least one clamping screw does not extend through the light source assembly, characterized in that locking means are provided, by means of which the light source assembly can be fixed relative to the assembly carrier, -) wherein the locking means fasten the light source assembly on the assembly carrier and the secondary optical unit carrier, -) and wherein the locking means comprise at least one locking screw, wherein said locking screw extends through a back side of the assembly carrier, through an assigned locking-screw opening in the assembly carrier, and through an assembly opening of the light source assembly, and can be screwed into a corresponding locking-screw thread in the secondary optical unit carrier. -) one or more light sources, which is/ are arranged on a light source carrier, -) at least one auxiliary optical unit, wherein said at least one auxiliary optical unit can be fastened on the light source carrier by means of an auxiliary optical unit carrier such that the light sources, the light source carrier, the at least one auxiliary optical unit, and the auxiliary optical unit carrier form a light source assembly, -) a secondary optical unit, which is arranged behind the at least one auxiliary optical unit, in the light exit direction, and is held by a secondary optical unit carrier, -) and wherein, in addition, an assembly carrier is provided, relative to which the light source assembly can be fastened, -) and wherein clamping means are provided, by means of which the light source assembly can be detachably clamped between the secondary optical unit carrier and the assembly carrier, -) and wherein, in the detached state of the clamping means, the light source assembly is displaceable substantially parallel to the assembly carrier, -) and wherein the clamping means comprise at least one clamping screw, by means of which the assembly carrier and the secondary optical unit carrier can be directly connected to one another such that the at least one clamping screw does not extend through the light source assembly, -) wherein the locking means fasten the light source assembly on the assembly carrier and the secondary optical unit carrier, -) and wherein the locking means comprise at least one locking screw, wherein said locking screw extends through a back side of the assembly carrier, through an assigned locking-screw opening in the assembly carrier, and through an assembly opening of the light source assembly, and can be screwed into a corresponding locking-screw thread in the secondary optical unit carrier.