FIG. 1 is a first isometric view of an first embodiment of an ornamental design for a portable light;

FIG. 2 is a second isometric view of the first embodiment of an ornamental design for a portable light as shown in FIG. 1;

FIG. 3 is a third isometric view of the first embodiment of an ornamental design for a portable light as shown in FIGS. 1 and 2;

FIG. 4 is a view of one end of the first embodiment of an ornamental design for a portable light as shown in FIGS. 1, 2 and 3;

FIG. 5 is a first isometric view illustrating a first position in a range of positions of a part of the first embodiment of an ornamental design for a portable light as shown in FIGS. 1, 2, 3 and 4; and

FIG. 6 is an isometric view illustrating a second position in a range of positions of a part of the first embodiment of an ornamental design for a portable light as shown in FIGS. 1, 2, 3, 4 and 5.

FIG. 7 is a first isometric view of an second embodiment of an ornamental design for a portable light;

FIG. 8 is a second isometric view of the second embodiment of an ornamental design for a portable light as shown in FIG. 7;

FIG. 9 is a third isometric view of the second embodiment of an ornamental design for a portable light as shown in FIGS. 7 and 8;

FIG. 10 is a view of one end of the second embodiment of an ornamental design for a portable light as shown in FIGS. 7, 8 and 9;

FIG. 11 is an isometric view illustrating a first position in a range of positions of a part of the second embodiment of an ornamental design for a portable light as shown in FIGS. 7, 8, 9 and 10; and

FIG. 12 is an isometric view illustrating a second position in a range of positions of a part of the second embodiment of an ornamental design for a portable light as shown in FIGS. 7, 8, 9, 10 and 11.

FIG. 13 is a first isometric view of the third embodiment of an ornamental design for a portable light;

FIG. 14 is a second isometric view of the third embodiment of an ornamental design for a portable light as shown in FIG. 13;

FIG. 15 is a third isometric view of the third embodiment of an ornamental design for a portable light as shown in FIGS. 13 and 14;

FIG. 16 is a view of one end of the third embodiment of an ornamental design for a portable light as shown in FIGS. 13, 14 and 15;

FIG. 17 is an isometric view illustrating a first position in a range of positions of a part of the third embodiment of an ornamental design for a portable light as shown in FIGS. 13, 14, 15 and 16; and,

FIG. 18 is an isometric view illustrating a second position in a range of positions of a part of the third embodiment of an ornamental design for a portable light as shown in FIGS. 13, 14, 15, 16 and 17.

Broken lines in the illustrations of the FIGURES of the drawing indicate parts of the article that are not part of the design claimed therein.