Ambilight 4k project

Hi,
I’m kind of new to this customization , I started out reading a lot of threads of ambilight projects and I’ve seen pretty nice ones, however , there are some question that are still going through my mind.

I bought a 4k Tv recently and after seeing the ambiligth effect, I have decided to build it in my tv too, however, since I’m also going to need an android box, what’s the best way(and the most inexpensive one) of buying an ambilight setup?

I know that some boxes could run Openelec, however, I was looking for a Nvidia shield, and after that , I was not really into buying one raspberry or other arduino in other to control the light system.

Does anyone got an android box setup?

Regards