A few guidelines will help the designer position wallwashers correctly, thereby achieving a very even light on the wall: the offset of the luminaire from the wall should be one third of the room height. Alternatively, the offset from the wall can be found by extending a 20° line from the base of the wall up to the ceiling. A lower offset from the wall will give a bright patch of light (hotspot) just in front of the luminaire, this will impair the vertical uniformity on the wall. Furthermore, with lens wallwashers, the light distribution will then no longer reach the base of the wall. Additionally, the texture of the surface will appear less soft because the increased component of grazing light will cause a greater degree of shadow.