I'm not quite sure what bumpmapping is, so I have no idea what your trying to do with that. If you want to set it up using the always event, then choose "Light," "set position", change X to "MouseX" and Y to "MouseY." Otherwise, just add the behavior, "Mouse," to your "Light." Also, you may have to set the hot spot, so double click on "Light" and set the "hot spot(and orange dot in the tool bar on the left)" to the center of "Light." It should work after that.