Turner F:
I would be willing to bet it’s not very common. But might become more so just as it looks ‘tasteful’ adding kind of a theater experience ambiance as more and more homes are built with dedicated, windowless HT areas.
My husband wanted to do this. (We have not yet). We have certain lights, which are on a dimmer, and one of the unidirectional cans tends to reflect off the protective screen on our display. If we take the lights low enough to remove the reflection it tends to darken the room to a point where I feel it adds to eyestrain when watching movies for prolonged lengths of time. So we will prob. try the back lighting in the future as I feel it might help alleviate that situation. We have not tried this yet so I can not relate personal experience.

DragonMonger
I will try to find some other products in the next couple of days, that was the only one I knew right off the bat.