A lampholder has a socket having an inner end, formed with seats adapted to hold contacts, and forming an outwardly open hole defining an axis and adapted to fit with a base of a high-voltage lamp and a base fittable against the inner end and having a floor formed with an axially throughgoing hole. A clip is formed with a bight engaged in the hole, a pair of arms extending from respective ends of the bight axially outward into the socket, outer tabs on the arms bearing axially inward on the socket, and inner tabs at the bight bearing axially outward on the floor of the base so that the clip holds the socket and base together.