I agree that the intensity of that one light is very overwhelming but you should still see its effect on the scene.  We really need more information about the scene setup.  Is there an environmental background surrounding the set?  Are you certain about the light count you are using?  Double-check the Light Controls.  I seriously doubt that ambient reflection in Superfly will have any effect on the lighting as odf is suggesting especially if you claim that only 3 lights are present.  Test render with each individual light on and see if you have the intended effect.  I don't know where your lights are positioned but in testing the Dist End setting on the parameter, my spotlight barely reaches the scene from its present default position.  We really need more information.  And as an aside, you have some very bad shaders on your models in the scene, self glowing is one of them.  But that is a different issue.