Washer
Washer refers to a lighting system. Initially&sbquo "wall washer" was the name given to a method that provided uniform illumination over the entire surface of the wall by linking a series of down-lights. Increasing the luminosity of the entire wall results in experiencing the entire space as illuminated. In other words&sbquo when the brightness of the vertical body&sbquo namely the wall&sbquo is made average from bottom to top&sbquo the psychological effect is that we perceive the space itself to be bright. The "celling washer" is an attempt to see what effect turning the entire ceiling into an illuminating surface would have on this psychological brightness. The "floor washer" and "street washer" were developed to understand the effects of uniform lighting and the methods of presenting it. Of course&sbquo technology pertaining to the technical sense requires the development of lighting technology pertaining to the lighting format&sbquo lighting fixtures and their arrangement&sbquo how to control the brightness of the light source&sbquo and especially the diffusion of light and excessive brightness. In the field of architectural lighting&sbquo It seems that the concept of the washer and its concrete forms will become a means to accomplish an interactive design between the space&sbquo its character&sbquo and human psychological states through various lighting effects. The effect of the lighting is that it's possible to produce the sense one is truly experiencing brightness by establishing apparent brightness through the uniform luminosity of the surfaces. Accordingly&sbquo the discovery of the wall washer method has become one of the principles of space lighting. The luminosity or brilliance of an illuminated surface&sbquo rather than the physical principle that says "the higher the luminosity the brighter&sbquo" shows very clearly that the important relationship is with psychological perception rather than with the physiological sense of brightness. This lighting control-which we should call the "washer effect"-is leading to the creation of a relationship between lighting technology and lighting design.