Abstract: An electrical light fixture assembly for attachment to a mounting panel having a front surface, a back surface and an installation hole formed therethrough. The assembly comprises a housing including a base having a rearwardly facing surface and having at least one knockout disc formed therein and a sidewall extending forwardly of the base to define a hollow enclosure having a front opening. When the housing is inserted into the installation opening, the rearwardly facing surface of the base of said housing is in substantially the same plane as the back surface of the mounting panel. A plurality of tab members extend outwardly from the sidewall, the tab members being adjacent to the front opening of the hollow enclosure and engage the front surface of the mounting panel, thus limiting the entry of the housing through the installation hole of the panel. A stop member is secured to the base for limiting the degree of rotation of an at least one clamp member.