The ornamental design for an ledbulb for lightingfixure, as shown and described.
FIG. 1 is a first perspective view of an LED bulb for lighting fixture showing my design;
FIG. 2 is a front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken lines shown in the drawings depict portions of the LED bulb for lighting fixture in which the design is embodied that form no part of the claimed design.