The ornamental design for an ledbulb, as shown and described above.
FIG. 1 is a perspective view of an led bulb showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a front elevational view thereof; and,
FIG. 7 is a rear elevational view thereof.
The shade lines (continuous solid lines of reduced opacity) in the figures show surface contour but not surface ornamentation. The broken lines are environmental and form no part of the claimed design. The ornamental design is that of an LED bulb that has a bulb shell/bulb body with an arcuate or circular arc shape without being overly spherical (in other words, being almost perfect sphere), flattened, or elongated, and the shape of the bulb shell resembles a teardrop. As a result, the overall shape of the claimed design of the LED bulb is more aesthetically pleasing and of possessing design uniqueness.