i get it it was the phong shader, i took the PhongE-shader from maya and enabled the raytracing engine in texture and render globals - tipp do not modify the raytracings settings to not taking to mutch transparency.... it will **** up your pc's performance:o
its a bit messy with making light sources, i just took two directional lights with density 0,55 uo to 0,78 more it overwelming less is making it dirty yellow...

cu

look here: