We claim, the ornamental design for a luminaire structure, as shown and described.
FIG. 1 is a bottom, perspective view of a luminaire structure, showing our new design;
FIG. 2 is a perspective view as viewed from above thereof;
FIG. 3 is a front elevational view thereof, where the rear elevational view is a mirror of this view and, therefore, has been omitted;
FIG. 4 is a side elevational view thereof, where the opposite side elevational view is a mirror of this view and, therefore, has been omitted;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
The broken lines in the drawings illustrate portions of the luminaire structure which form no part of the claimed design.
The luminaire is shown with symbolic break lines along its dimensions. The appearance of any portion of the article between the break lines forms no part of the claimed design.