The ornamental design for a red lighttherapybelt, as shown and described.
FIG. 1 is a perspective view of a red light therapy belt 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 perspective view of the red light therapy belt where the red light therapy belt is in a configuration of use; and,
FIG. 10 is an enlarged view of portion 10 shown in FIG. 2.
The short thick evenly spaced broken lines in the drawings depict stitching and form part of the claimed design. The long thin evenly spaced broken lines in the drawings depict portions of the red light therapy belt and form no part of the claimed design. The dot-dash broken lines represent the boundary of the enlarged portion and form no part of the claimed design.