The ornamental design for a light-emitting diode unit for illuminating an object, as shown.
FIG. 1 is a perspective view of a light-emitting diode unit for illuminating an object in accordance with the present design, as viewed from above;
FIG. 2 is a perspective view thereof, as viewed from below;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
A rear elevational view would be identical to the front elevational view of FIG. 3 and a left side elevational view would by identical to the right side elevational view of FIG. 4.