The ornamental design for a portablelight with reflectivestructure, as shown and described.
FIG. 1 is a front view of the portable light with reflective structure showing my new design;
FIG. 2 is an enlarged portion taken from the circumscribed area marked 2 in FIG. 1;
FIG. 3 is a top view of FIG. 1; and,
FIG. 4 is a bottom view as seen from underneath of the reflective structure in FIG. 1.
The broken line showing of portions of the portable light with reflective structure is included for the purpose of illustrating environmental structure and forms no part of the claimed design.