An enclosure is arranged for housing electronics associated with a luminaire and includes a first member including a mounting interface arranged to couple the first member to the luminaire and a second member mechanically coupled to the first member. The mounting interface facilitates provisionally coupling the first member to the luminaire and securing the enclosure to the luminaire. A corresponding mounting apparatus for securing an enclosure to a luminaire includes a mounting member having an opening and configured to be secured to a surface of a luminaire and a neck portion extending from the enclosure and configured to pass through the opening. The neck portion includes a neck opening that is configured to allow wiring to be routed from the electronics to the luminaire. The neck portion and the mounting member may include respective complementary surfaces to provide a mounting interface for provisionally coupling the enclosure to the luminaire.