Mounting structure for lighting device, corresponding lighting device and method

The present invention provides a mounting structure for a lighting device, such as a lamp or a modified light bulb for automotive applications, which includes a light generator carrier part having anelongate body extending along a longitudinal axis and a ring part assembled on the elongated body of the carrier part. The elongated body or ring part of the carrier part carries one or more tooth members that protrude toward the other of the elongated body or ring part of the carrier part. The other of the elongated body or the ring part of the carrier part includes one or more arcuate engagementformations for the tooth members, wherein the carrier part and the ring part are restricted along the mutual displacement of the longitudinal axis by the following manner: the tooth member and the arcuate engagement forming part are engaged in such a manner that at least one tooth member can be displaced along the arcuate engagement forming part, the elongate body of the carrier part is enabled to rotate relative to the r