Wall washing vs wall grazing

Wall washing places light at a controlled distance from the wall to create a broad and relatively even vertical field. Wall grazing moves the luminaire much closer to the surface so shadows reveal texture and depth. The correct choice depends on whether the design objective is uniform brightness or material expression.

Typical applications

• Mosque calligraphy and decorative wall bands
• Mihrab walls and stone cladding
• Museum and gallery exhibition walls
• Historic masonry and heritage interiors
• Cultural-centre foyers and ceremonial halls
• Exterior stone facades, columns and arches
• Timber slats, relief panels and textured surfaces

Spacing and setback

There is no universal spacing rule. Optic, wall height, setback, luminaire-to-luminaire distance and surface reflectance should be evaluated together. Linear wall washers can provide continuous vertical light, while individual asymmetric projectors can be useful on taller or irregular architecture.

Avoid scallops and hot spots

Poor spacing can create visible bright patches and dark gaps. A photometric study should verify overlap across the full height of the target wall. Mock-ups are especially valuable on polished stone, reflective tiles, metallic ornament and irregular historic surfaces.

Exterior use

For facade and monument work, consider IP rating, drainage, corrosion environment, maintenance access and stray light. In heritage projects, mounting should be as visually discreet and physically reversible as the building rules require.

Wall washer vs wall grazer

Setback and spacing strategy

Setback determines how the beam opens across the wall; spacing determines whether adjacent distributions overlap smoothly. The correct relationship depends on the luminaire optic and wall height. Manufacturer photometrics or a lighting calculation should be used instead of copying a fixed spacing rule from another product.

Surface material changes the result

Highly polished stone can reveal bright reflections, while rough stone creates deeper micro-shadows. Timber, metallic calligraphy and glazed tiles can also react strongly to grazing light. A mock-up is particularly valuable on reflective or historically sensitive materials.

Mosque applications

• qibla and mihrab walls
• calligraphy bands and decorative panels
• stone or marble column cladding
• timber slat and relief surfaces
• entrance portals and exterior arches

Museum and cultural applications

Wall washing supports large exhibition walls and can make a gallery feel brighter without excessively raising floor illumination. Grazing should be used deliberately because strong texture can distract from artwork if applied indiscriminately.

Specification checklist

• wall height and total length
• mounting setback and fixture spacing
• optical distribution and orientation
• CCT and colour quality
• dimming/control requirements
• surface finish and reflectance
• IP/IK rating for exterior use
• continuous-run joining details for linear products
• access for cleaning and replacement

Häufig gestellte Fragen

Why do scallops appear on the wall?

Usually because spacing, setback or the optic does not create sufficient overlap. A photometric study can reveal the pattern before installation.

Should a historic stone wall be washed or grazed?

It depends on whether the goal is calm uniformity or texture. Grazing can reveal workmanship beautifully, but it can also exaggerate defects and repairs.

Can wall washing be used outdoors?

Yes, with suitable exterior-rated luminaires, drainage, cable entries, mounting and glare/spill control.