Creating a TV with correct lighting

I'm trying to create a TV in my scene. I got the TV to play but i'm having trouble getting the correct lighting from the mesh. The lighting should change based on whats on the screen. not sure how to do this? So Far i tried using dynamic lighting via

 ` Color colorLight = Color.white * Mathf.LinearToGammaSpace(5);
          renderer.material.SetColor("_EmissionColor", colorLight);
          DynamicGI.SetEmissive(renderer, colorLight);`
 

That just bumps the white color up.(or what ever color i put).

Thank you