The ornamental design for a connector for lamp, as shown and described.
FIG. 1 is a perspective view of a connector for lamp, showing my new design.
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left elevational view thereof;
FIG. 5 is a right elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is another perspective view thereof;
FIG. 9 shows the article in a position of use; and,
FIG. 10 shows the article in another position of use.
The even-broken line in the figure drawing views represents environment or portions of the connector for lamp that forms no part of the claimed design.