TransformGroup group = new TransformGroup( );
. . .
PointLight light = new PointLight( );
light.setEnable( true );
light.setColor( new Color3f( 1.0f, 1.0f, 1.0f ) );
light.setPosition( new Point3f( 0.0f, 1.0f, 0.0f ) );
light.setAttenuation( new Point3f( 1.0f, 0.0f, 0.0f ) );
. . .
light.setInfluencingBounds( bounds );
group.addChild( light );