Exporting lights through Max is currently not supported and causes the type of issue you're seeing.
It is possible to disable lights on certain nodes. In the following code only
light1 is disabled on the basketball:
Code:
import viz
import vizact
viz.setMultiSample(4)
viz.fov(60)
viz.go()
soccerball = viz.addChild('soccerball.osgb')
basketball = viz.addChild('basketball.osgb')
volleyball = viz.addChild('volleyball.osgb')
soccerball.setPosition([-0.5,2,1.5])
basketball.setPosition([0,2,1.5])
volleyball.setPosition([0.5,2,1.5])
headLight = viz.MainView.getHeadLight().disable()
light1 = viz.addLight()
light2 = viz.addLight()
light2.setEuler(0,90,0)
basketball.disable(viz.LIGHT0 + light1.getNumber())