The ornamental design for a barbecuegrilllight, as shown and described.
FIG. 1 is a top perspective view of a barbecue grill light showing our new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is rear elevational view;
FIG. 6 is a is a right side elevational view thereof; and,
FIG. 7 is a is a left side elevational view thereof.
The broken lines showing a supporting neck and clamp and other detail of the barbecue grill light are for the purpose illustrating environmental structure and form no part of the claimed design. The broken line circles on the face of the three lamps of the barbecue grill light represent the bounds of the claimed design and form no part thereof.