A light assembly includes a housing which defines a longitudinal axis. A hollow holding ring and a reflector are fixed within the housing and spaced apart along the axis. A hollow positioning sleeve is disposed at a rear end of the reflector and is arranged on the axis at a distance forwardly from the holding ring. A tube extends along the axis and includes front and rear portions. The front portion is mounted in the positioning sleeve and includes a bulb receptacle for positioning a bulb within the reflector. The rear portion includes an electrical connection portion disposed in the holding ring. The tube is inserted axially through the holding ring and the positioning sleeve and into the reflector and then is rotated about the axis in order to cause the tube to become locked against axial movement relative to the reflector, as well as to bring an electrical contact into connection with an electrical power supply.