FIG. 1 is a front, left, bottom, perspective view of an elliptical ballast box luminaire, showing a first embodiment of our new design;

FIG. 2 is a right side elevational view thereof, the left side being a mirror image;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a front, left, bottom, perspective view of an elliptical ballast box luminaire, showing a second embodiment of our new design;

FIG. 8 is a right side elevational view thereof, the left side being a mirror image;

FIG. 9 is a top plan view thereof;

FIG. 10 is a front elevational view thereof;

FIG. 11 is a rear elevational view thereof;

FIG. 12 is a bottom plan view thereof;

FIG. 13 is a front, left, bottom, perspective view of an elliptical ballast box luminaire, showing a third embodiment of our new design;

FIG. 14 is a right side elevational view thereof, the left side being a mirror image;

FIG. 15 is a top plan view thereof;

FIG. 16 is a front elevational view thereof;

FIG. 17 is a rear elevational view thereof; and,

FIG. 18 is a bottom plan view thereof.

The subject matter shown in broken line represents unclaimed fluorescent lamps which are shown for illustrative purposes and form no part of the claimed design.