The ornamental design for an ledlightbulb with one led, as shown and described.
FIG. 1 is a perspective of a third embodiment of the LED light bulb with one LED wherein the LED may be in the form of a multi junction technology LED;
FIG. 2 is a rear elevation of the third embodiment;
FIG. 3 is an elevation showing the left side of the third embodiment;
FIG. 4 is an elevation showing the right side of the third embodiment;
FIG. 5 is a front elevation of the third embodiment;
FIG. 6 is a top plan of the third embodiment; and,
FIG. 7 is a bottom plan of the third embodiment.
The broken lines shown in the drawings indicate structure and features which form no part of the claimed design.