The ornamental design for a powerfailurelight, as shown and described.
FIG. 1 is a perspective view of a power failure lamp showing the new design, the extended plug connection shown in broken lines forming no part of the claimed design;
FIG. 2 is a front view thereof;
FIG. 3 is back side view thereof, the extended plug connection, recess for storing folded in plug connection, and rivets or screws shown in broken lines forming no part of the claimed design;
FIG. 4 is a left view thereof, the extended plug connection shown in broken lines forming no part of the claimed design;
FIG. 5 is a right side view thereof, the extended plug connection shown in broken lines forming no part of the claimed design;
FIG. 6 is a top view thereof, the extended plug connection shown in broken lines forming no part of the claimed design; and,
FIG. 7 is a bottom view thereof, the extended plug connection shown in broken lines forming no part of the claimed design.
The broken line showing is for illustrative purposes only and forms no part of the claimed design.