The ornamental design for a led grow light, as shown and described.
FIG. 1 is a perspective view of a LED grow light showing my new design;
FIG. 2 is another perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a right side elevational view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a bottom plan view thereof;
FIG. 9 is an enlarged view of the encircled portion 9 of FIG. 2; and,
FIG. 10 is an enlarged view of the encircled portion 10 of FIG. 4.
The evenly spaced broken lines in the drawings are for the purpose of illustrating portions of the LED grow light that form no part of the claimed design. The unevenly spaced broken lines delineate areas of the figures shown enlarged and form no part of the claim.