The ornamental design for a lens for a phototherapycap, as shown and described.
FIG. 1 is an upper perspective view of a lens for a phototherapy cap showing our new design;
FIG. 2 is a lower perspective view of the lens for a phototherapy cap;
FIG. 3 is a top plan view of the lens for a phototherapy cap;
FIG. 4 is a bottom plan view of the lens for a phototherapy cap;
FIG. 5 is a left side elevational view of the lens for a phototherapy cap;
FIG. 6 is a right side elevational view of the lens for a phototherapy cap;
FIG. 7 is a rear elevational view of the lens for a phototherapy cap; and,
FIG. 8 is a front elevational view of the lens for a phototherapy cap.
The broken lines immediately adjacent the shaded areas represent the bounds of the claim, while all other broken lines are directed to environment and are for illustrative purposes only; the broken lines form no part of the claimed design.