To give it a more natural behaviour I also used the ‘y2’-Variable to set the X-scale of the flashlight. 
Set Property ("/light2/light", X Scale) = 100-(y2/5)
The whole Action-script to move and alter the flashlight is now:
x1 = getProperty("/light2", _x);
y1 = getProperty("/light2", _y);
x2 = int((x1-380)/4.22);
y2 = int((y1-300)*-0.8);
if (y2<100)  {
   y2 = 100;
}
setProperty ("/light2/light", _rotation, x2);
setProperty ("/light2/light", _yscale y2);
setProperty ("/light2/light", _xscale, 100-(y2/5));
setProperty ("/switch/case", _rotation, int((x2*-0.7))=67)