I have a USB light strip on the back of my DLP HDTV in the living room, and I use one of these behind the monitors on the office desk: https://www.amazon.com/gp/product/B0721VZDFL/

The need for this is (IMO) greatly dependend on how bright you have the TV/monitor set. My DLP HDTV throws a TON of light straight out, so it'll make your eyes water if the room is black. My monitors are much more controlled.