The ornamental design for a ledstriplightcontroller, as shown and described.
FIG. 1 is a perspective view of a LED strip light controller showing the claimed design;
FIG. 2 is another perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a right side elevational view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken lines consisting of evenly spaced dash lines in the drawing depict parts of the LED strip light controller that form no part of the claimed design.