[Paraview] Lighting in Paraview

[the lily]

Dear all 
I'm trying to understand how is paraview applying the lighting, is it using more than one lighting resource 
I found head lighting, back lighting ...
and how can I disable all different lights (using python scripting) and work only with a regular ambient light ? 		 	   		  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.paraview.org/pipermail/paraview/attachments/20130228/4de3a536/attachment.htm>