Support structure configured to engage both a lamp and adjacent structure, after the lamp has been installed horizontally in a socket, and maintains the lamp in horizontal alignment with regard to the socket. The lamp is installed in the socket, at least one adjustable length pins of the support structure is adjusted to a desired length, and the support structure is engaged with the lamp. If the lamp was installed in a ceiling, a lens or cover is also installed. Regardless, the support structure engages an adjacent surface (such as the ceiling lens or cover, or a surface in the recess of a wall), thereby maintaining the lamp in horizontal alignment with regard to the socket.