FIG. 1 is a front, left side perspective view of a post lighting fixture showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof, the left elevational view and the right elevational view being identical to the rear elevational view;

FIG. 6 is a front elevational view of a first alternative embodiment of a cap detail of my new design, the left elevational view, right elevational view, and rear elevational view being identical to the front elevational view;

FIG. 7 is a top plan view of the first alternative embodiment of the cap detail of my new design;

FIG. 8 is a front elevational view of a second alternative embodiment of a cap detail of my new design, the left elevational view, right elevational view, and rear elevational view being identical to the front elevational view;

FIG. 9 is a top plan view of the second alternative embodiment of a cap detail of my new design;

FIG. 10 is a front elevational view of a third alternative embodiment of a cap detail of my new design, the left elevational view, right elevational view, and rear elevational view being identical to the front elevational view;

FIG. 11 is a top plan view of the third alternative embodiment of a cap detail of my new design;

FIG. 12 is a front elevational view of a fourth alternative embodiment of a cap detail of my new design, the left elevational view, right elevational view, and rear elevational view being identical to the front elevational view;

FIG. 13 is a top plan view of the fourth alternative embodiment of a cap detail of my new design;

FIG. 14 is a front elevational view of a fifth alternative embodiment of a cap detail of my new design, the left elevational view, right elevational view, and rear elevational view being identical to the front elevational view; and,

FIG. 15 is a top plan view of the fifth alternative embodiment of a cap detail of my new design.

The broke lines are shown in FIGS. 1 and 4 for illustrative purposes only and form no part of the claimed design.