If at all possible, be at a 45 to 90 degree angle from the lighting. Any less than 45 degrees and you run a good and getting better risk of seeing the light's reflection. Have someone move the lights around the room while you look through the viewfinder and see where it will look best.

Depending on the size of the wall, the room you have to back up, and the power of your lights, this could be a LOT of trial and error. But luckily, it's something you can see in the viewfinder.

Hope this makes sense, and happy shooting-
-Lew