As in the comments says, you have to put in the ScreenX and ScreenY of the NormalMap effects the screen resolution of your game. 640x480, 960x540 32x240 or whatever.
If your resolution is: 960x540
Screen X = 960
Screen Y = 540
After this, the light will follow your mouse.
The light on the mouse form the example .capx not works for you?
Parameter 0 and 1 of the effect are the position of X/Y of the light that are passed using the events.
Parameter 0 (X) = (LayerToCanvasX(0, mouse.x, mouse.y))/WindowWidth
Parameter 1 (Y) = (LayerToCanvasY(0, mouse.x, mouse.y))/WindowHeight
The layerToCanvas option is because with that will works with ScrollTo too.
If you are having problems try to change Light1 in the events by this:
Parameter 0 (X) = mouse.x/WindowWidth
Parameter 1 (Y) = mouse.y/WindowHeight