A light assembly including a light having a body with a ramp and a threaded opening. The body also has one end and another end having an outwardly extending flange, an elongated light central axis, and an outer surface having the ramp closer to the elongated light central axis at the one end of the light. The ramp is further away from the elongated light central axis near the other end. The light assembly also includes a lock piece having an end, and the lock piece is positioned on the body for movement along the ramp away from the one end, so that the lock piece end moves further away from the elongated central axis as the lock piece moves along the ramp away from the one end. The light assembly also includes a like threaded stem having an elongated axis and received in the threaded opening in the light, the stem being connected to the lock piece so that, as the threaded stem rotates about its elongated axis in the threaded opening, moving away from the light one end, the stem moves the lock piece away from the one end.