How to turn off a light for a short moment and then turn it back on?

How can I make the light of a spotlight in this case turn off for a very brief moment and then turn it back on?

You could turn it off with the function BlinkLight, then turn it on again in Update (light script):

var blinkTime: float = 0;

function BlinkLight(time: float){
  blinkTime = time; // set off timer...
  light.enabled = false; // and turn light off
}

function Update(){
  if (turnOffTime >= 0){ // if off timer active...
    turnOffTime -= Time.deltaTime; // decrement it
    if (turnOffTime < 0){ // if off time elapsed...
      light.enabled = true; // turn light on again
    }
  }
}