If one light is set higher than the other, the room may appear unbalanced. Sconces on each side of the bathroom mirror are most effective when used in pairs.  If you enjoy the aesthetic of a sconce and want one, consider putting it above the mirror. Installing a sconce above your mirror not only creates an elegant look but is also perfect for those who want to be able to use it as they dress. Installing sidelights at a lower height in a children's restroom should be avoided.