The aftermarket lights that I have seen include a sensor that is placed on top of the television which takes its cues from what is on the screen, but, I am sure there are others. This light altering bias lighting has been standard equipment on Phillips televisions for years who started the whole concept, however, I have no idea how their system works. Of course, Phillips doesn't sell its monitors in N/A. In any case, if the television isn't right up against the wall, the light is just spread over a wider area and depending on the color of the wall, it probably would be best to pick a brand that gives you the choice to switch between multiple colors and brightness to match up a little better.
