The ornamental design for an emergencylightstrap, as shown and described.
FIG. 1 is a front perspective view of an emergency light strap;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a left side elevation view thereof, the right side elevation view being a mirror image thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a perspective view of the emergency light strap shown in use.
The broken lines showing a traffic light in FIG. 7 depicts environmental subject matter that forms no part of the claimed design, while the remaining broken lines shown in the drawings depict portions of the emergency light strap that form no part of the claimed design.