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two side lighting

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I sorry for the confusion I open this new post for explain what i wish do:
I have a shader that displays a front/back material color face and i would create a light system like the sun that illuminates both the front and the back face of a mesh(for example a quad) in all camera position.
i think that i must use a directional light but if i use two directional lights with opposite direction for lighting the two side of the mesh the diffuse component is 0 .
How i can illuminate the two side of the quad?

thanks

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