Patent ID: 8193690

Claim:
A cap and socket arrangement for compact fluorescent lamps, the lamp comprising a discharge tube arrangement made of glass and having sealed ends being positioned at one end of the lamp; the discharge tube arrangement forming a continuous arc path and being provided with electrodes disposed at each end of the arc path; at least one of the sealed ends also being provided with an amalgam fill; the sealed ends of the discharge tube arrangement being received in the cap, the cap comprising contact members, and a protruding fitting member for being received in the socket, the socket comprising a hollow member for receiving the fitting member of the cap, and contact elements for receiving the contact members of the cap; the fitting member of the cap of the lamp having an asymmetric groove; and the socket being provided with an asymmetric key element to be associated with the asymmetric groove of the cap for determining the position of the cap with respect to the socket.