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Facade lighting design:Wall Washing VS Wall Grazing

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Regarding facade lighting design, two concepts (namely, wall washing and wall cleaning) need to be carefully considered in the design stage. What is the difference between them? please watch the following part:


Wall Washing


The word "washing the wall" is self-explanatory and can be interpreted as washing the wall uniformly by using light (ie, evenly illuminating the wall surface). This can be achieved by evenly distributing the lumens over the entire wall surface from top to bottom without creating any dark lumens. Choosing the right fixing device helps to wash the wall accurately. This uniform lighting of the entire wall helps to hide imperfections in the artwork and also helps to eliminate shadows on the surface.


The wall washing effect with uniform lighting makes the appearance of the wall clearer and brighter. It also helps to better strengthen the structure of the wall surface. Some lighting designers also believe that washing the walls makes the whole room look more lively.


In order to obtain an effective and attractive wall washing effect, the lamps need to be installed at the ceiling height or higher, so that the lamps can effectively "wash" the vertical space. The luminaire also needs to keep a sufficient distance from the wall surface so that the light can spread out with a wider beam angle. The light should be level with the eyes or inclined towards the center of the feature or artwork.


Designers always recommend and practice the use of multi-directional lighting fixtures for wall washing. For example, the use of asymmetrical lamps can help to achieve the wall washing effect. The application of asymmetrical lamps provides one-way lighting.


It is best to use wall washer on walls that have a flat, smooth surface to limit shadows. With the advent of LED lamps, the flexibility provided by well-known manufacturers can help achieve uniform, shadow-free wall wash quality.




Façade Illumination of a Villa and Building, completely designed by using DIALux Evo Software.

Illumination resulting the wall grazing effect.

Light fixtures are installed closer to the walls.

Wall grazing is enhancing the shadows on the wall surface.


Wall Grazing


Wall predation is another way to illuminate the surface, which is the opposite of wall cleaning. In terms of wall washing effect, the surface lighting is uneven compared to wall washing.


By enhancing shadows, wall predation helps to make textured vertical surfaces more visible or prominent. By providing lighting on top of the textured surface, wall scratches will produce very obvious or obvious shadows, making the textured surface of the wall more beautiful.


By setting the lighting device closer to the wall so that the lux level decreases as the distance from the lighting device decreases, a wall predation effect can be achieved. The lamp can be placed on the ground and focused in an upward direction to create a mysterious, seductive or fascinating effect on the surface.


This method is usually used for the lighting of statues. By installing lamps near the wall surface or far away from the wall, the shadow effect on the surface can be more or less emphasized.


Generally, it is assumed that the facade lighting can be obtained by providing lighting (daylight or RGBW color lamps can be used). Choosing the right lamps and their positions is very important for the facade lighting design. In addition, with the advent of LED lamps, it can be used flexibly when choosing the type and color of lamps.


Compared with traditional lamps, LED lamps are energy efficient and have a longer service life. Compared with traditional lamps, LED lamps provide flexibility in controlling the beam angle and its propagation, and have higher accuracy. There are few parameters discussed here, which may be helpful for facade lighting design.




Choose the appropriate LED wall washer/grazing LED lamps according to the project area and distance: the projection distance is related to the lens and power supply. The higher the optical power, the brighter the projection brightness, and the narrower the lens angle, the longer the projection distance.


It is best to let the manufacturer provide you with the basic luminosity data of their products. In addition, the façade lighting is an outdoor lighting design, so the selected luminaires should have an appropriate IP rating and IK rating, so that the luminaires can withstand harsh and uneven environments.


The lighting effect should be decided according to the actual situation/mood/occasion: lighting effect such as RGB or RGBW and DMX512 control, DMX512 will change more according to actual needs. By using the fixtures and accessories described above, millions of color combinations can be created. The lighting effect can be changed according to the occasion and mood of the celebration.


Installation notes: When installing, the number of LED wall washers should also be determined according to the actual length string number. For example, if your new house ceiling design also uses this LED wall washer, because it can change various effects, you need to calculate how long the length of a circle needs to be connected according to each piece, whether it only needs to be changed once or flowed as a whole The effect changes, etc. The flexibility of LED lamps provides the best way to use the wall washer.