how many do you need ?
If this question is for me, you only need 1. You put it at the back of your TV. Measure the length of your TV and make sure that the T5 is completely hidden. for my 42pv80, I got the 24 inch length installed horizontally at the back of my TV, topmost portion. Just enough to hide the T5 but spilling over the light at the back wall.
Sayang wala akong pic eh.