Question How make stylized grass in default render?

I'm trying make stylized grass in default render, but i faced following problem: grass on plane back side looks much darker than on illuminated side.

At same time other people make grass is lit from both sides equally, and at takes on shadows.
http://www.youtube.com/watch?v=4OWA5vgZqvQ

how should it work?

 

The way I do is I plug a vector 3 into the normal of the shader and set it to 0,1,0 so it points up. Lemme know if it works for you

 

Thanks! Its work!