Abstract: The reflector lamp unit has an electric lamp (10) mounted in a reflector body (1) having a neck (4). A metal sleeve (20) is present around the neck. The sleeve has outward projections (21) to provide grip to retention means of a lamp holder, and inward projections (22) which engage grooves (6) present in the neck. The free-end portion (5) of the neck (4) extends beyond the sleeve (20). The unit is of a simple construction, which nevertheless provides for a rigid coupling of the sleeve (20) to the reflector body (1) even with large tolerances as to the size of the neck (4). The unit, moreover, obviates the risk of short-circuiting the contact elements of a lampholder by the metal sleeve.