I claim the ornamental design of a light guide, substantially as shown and described.
FIG. 1 is a top view of a light diffuser for modifying light distribution of a light source(s) in accordance with the present invention.
FIG. 2 is a bottom perspective view of the light guide in FIG. 1.
FIG. 3 is a left view thereof. FIG. 3 is also a right view thereof, front view thereof and back view thereof.
FIG. 4 is a top perspective view thereof; and,
FIG. 5 is a bottom perspective view thereof.
The broken lines, within the claimed design, in the interior portion of the light diffuser that depict protrusions and recesses, as well as the surface rectangles around the protrusions on the top of the light diffuser and the rectangle recessions on the bottom of the light diffuser are for illustrative purpose only. Furthermore, none of the broken lines form a part of the claimed design.