Lighting error

The two images are from the same instance of the same game. The only difference is that image 1 is near the center of the plane, and image 2 is near the edge. I would like the whole plane to be lit like image 2, how do I do this? I can not buy a pro lisence. I know I can increase the tesselation on the plane, but I’d rather not.

I figured it out! I had to adjust the “Pixel light count” in the quality settings.