Fluorescent lamp holder assembly (10) comprising a lamp holder (15) and a socket (20). The holder (15) houses one pair of electrical terminals, and includes one pair of openings (30) located at a position corresponding to the position of the electrical terminals. The lamp holder (15) includes one pair of parallel spaced-apart legs (35) with one end connected to the terminal and the free end protruding from the body of the holder (15). The socket (20) has one pair of spaced-apart electrical terminals defining insertion inlets (45). The holder (15) can be coupled to the socket (20) by inserting the legs (35) into the corresponding terminals of the socket (20). The holder assembly (10) further comprises releasable, resiliently biased locking means (60) movable between an opening position, in which holder (15) and socket (20) can be unplugged and a locking position, in which holder (15) and socket (20) are held together.