Prius level 5 “brow” light is out..need help

That's the parking light; it's a strip of LEDs. Is the whole strip out, or just a portion?

 

That helps narrow down the problem--if it was just part of the strip that was out, it would likely be one or more individual chips that had burnt out. But since it's the whole strip, it's probably a malfunction in the controller, the box that's screwed in under the headlight. If you're mechanically apt enough to remove the headlight yourself (it's not hard, but you do have to unfasten the top part of the bumper cover), the computer itself is easy enough to replace; just four screws to remove it, unplug, plug in the new one, make sure the gasket is fitted correctly, and refasten the four screws. This is the part you'll probably need, the Control Module 81107-47380. Before replacing that, however, check the wires to the headlight and, if you can pull it off the car, any of the wires you can see inside it to see if any are stripped, broken, etc. It might be as simple as a broken wire, but I suspect the computer.