Wall washing is a form of lighting where walls and facades are accented by a uniform brightness distribution from the top to the bottom. This type of lighting is ideal for lighting facades, plazas, entrance ways and hedges; and it is also used in museums. Wall flooding requires different optics and light outputs, as there are many different applications in this area. The luminaire must be installed within a certain distance from the surface which should be illuminated, because this is the only way to achieve a uniform brightness distribution.