I claim the ornamental design for a LED headlight, as shown and described.
FIG. 1 is a front view of a first embodiment of a LED headlight embodying my new design.
FIG. 2 is a back view thereof.
FIG. 3 is a side view thereof.
FIG. 4 is a bottom view thereof; and,
FIG. 5 is a top view thereof.
The broken line showing of rear and side portions of the claimed design is included for the purpose of illustrating only and forms no part of the claimed design.