Wall washing and wall grazing are often specified with the same linear luminaire. The difference lies almost entirely in where the luminaire sits and which optic it uses, and the result on the wall is completely different.
Washing: an even plane of light
Washing aims for uniform brightness across the surface. The luminaire is set back from the wall, commonly somewhere around a quarter to a third of the wall height for floor-mounted schemes, and uses an optic that spreads light evenly from bottom to top.
Use it when the surface is smooth (render, panels, painted concrete), when you want the building to read as a clean volume, or when signage and colour need even backgrounds.
Grazing: texture through shadow
Grazing places the luminaire tight to the wall, typically within 30 cm, so light skims the surface at a low angle. Every stone joint, brick course or timber board throws a shadow.
Use it when the material is the story, rough stone, brick, board-marked concrete, timber cladding.
Avoid it on imperfect render or uneven panels: grazing exposes every flaw.
Choosing the optic
| Situation | Typical approach |
|---|---|
| Tall wall, luminaire at base | Narrow beam to carry light up |
| Low wall or short throw | Wider beam for even coverage |
| Textured stone, tight to wall | Narrow beam, grazing position |
| Wall seen from close range | Shielded or recessed fixture |
Test before you order
Datasheets and renders get you close; a one-metre sample on the actual surface gets you certain. We recommend a mock-up for any facade where the material is the main feature.