Abstract: A plate-like support has a pair of opposite faces and is formed with a throughgoing opening. A synthetic-resin lamp holder having a longitudinally open socket is formed with a foot projecting generally perpendicularly of the socket through the opening and formed with respective longitudinally spaced front and back abutments bearing on one of the faces of the support and respective side retaining formations between the abutments. A plug engaged snugly against the other face of the support between the abutments of the foot is formed with a pair of retaining formations lookingly engageable with the formations of the foot. An electrical wire extends through the plug, through the opening, and between the abutments to the socket.