I've noticed lately that when viewing a movie on my Toshiba 50H81 with all lights out that I tend to get very tired and sleepy. So I did the research here and realized that I was straining my eyes when doing this. I want to go over to Wally World and get an inexpensive setup, but don't know what wattage I need for the bulb. Also, does it work better to somehow mount the tube fixture on the back of the set (don't want to if I don't have to), or can I lay the light down on the floor behind the TV and facing the wall? Thanks!