An electrically isolating lamp assembly comprises a clamp ring, a lamp end, and a socket, wherein the lamp end is positioned within the clamp ring and the lamp end can be rotated, relative to the clamp ring, between locked and unlocked positions. In the unlocked position, lamp end shoulders are radially non-aligned with clamp ring flanges, and a locking peg is restrained, by the clamp ring flange, from being inserted completely within a locking peg channel in the lamp end, whereby the socket is restrained from fully engaging the lamp end; in the locked position, the lamp end shoulders are radially aligned with the clamp ring flanges, and the locking peg is inserted completely within the locking peg channel, whereby the socket can fully engage the lamp end, and wherein the lamp end is restrained by the locking peg from being rotated to the unlocked position.