An apparatus and method for allowing rotational adjustment of a thread-in HID light source to a lighting fixture when in operative position in the fixture. In one aspect of the invention, a conventional thread-in arc lamp is threadably insertable into a socket that is mounted in the light fixture. A...http://www.google.fr/patents/US7547118?utm_source=gb-gplus-shareBrevet US7547118 - Mechanism to insure correct rotation of arc tube in socket
Mechanism to insure correct rotation of arc tube in socket
