Although it sounds easy, I can't achieve it...

Suppose I have a light source and I render a sphere. I would like to create a gradient material where the lighted areas are blue and the shadows orange.

I try to do with a node material using light path.... I place a mix shader connect it with two diffuse bsdf (one blue and one orange) and the light path to connect with fac...

what do I do wrong?

thank you....