The ornamental design for a lightingframe, as shown and described.
FIG. 1 is a front perspective view of a lighting frame showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a top view thereof; and,
FIG. 5 is a bottom view thereof.
The broken lines in the drawings illustrate portions of the lighting frame that form no part of the claimed design. Any unshaded surfaces between solid and broken lines form no part thereof.