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The ornamental design for an led light bulb, as shown and described.
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FIG. 1 is a top perspective view of an LED light bulb showing my design;
FIG. 2 is a bottom perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a perspective view similar to FIG. 1 but showing a variation of my design.
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