How to Light a Façade? Techniques, Luminaires and Design
Short answer
Façade lighting uses wallwashing, grazing, floodlighting and accent techniques together, according to the material and form of the façade, to make the building's architectural elements readable at night. Luminaires should be at least IP65, and light should be directed only onto the façade without spilling into the sky and the surroundings.
A well-lit façade makes a building part of the city at night as well: architectural elements become readable, the building gains an identity and the surroundings feel safer. A badly lit façade produces either a flat, lifeless brightness or light pollution that spills into the surroundings and the sky and wastes energy. What makes the difference is applying the right technique to the right surface.
Four basic techniques in façade lighting
| Technique | What it does | Where it is used |
|---|---|---|
| Wallwashing | Lights the surface evenly from top to bottom | Flat, rendered, large surfaces |
| Grazing | Strikes the surface at a very shallow angle to reveal texture and shadow | Stone, brick, timber, textured surfaces |
| Floodlighting | Lights a large area from a distance | Large volumes, distant façades |
| Accent | Makes a specific element brighter than its surroundings | Columns, domes, minarets, entrances, sculptures |
In most successful projects these techniques are used together: the façade as a whole is read in soft light, architectural elements are accented, and the entrance and floor lines are defined with linear light.
Choosing by material
- Stone and brick: Grazing light brings out the texture; warm 2700K–3000K tones enrich the material.
- Render and painted surfaces: An even brightness with wallwashing; because there is no texture, grazing light may look patchy.
- Glass: Glass does not reflect light, it transmits it; glass façades are mostly lit from inside or from the glazing frame.
- Metal and composite panels: Watch out for reflections and glare on shiny surfaces; indirect light is preferred.
What to look for when choosing luminaires
- Protection: At least IP65 for luminaires exposed to rain, IP67 for in-ground ones.
- Optics: Asymmetric optics for wallwashing, narrow beams for accents, distributions wide horizontally and narrow vertically for grazing.
- Durability: UV-resistant lenses and corrosion-resistant powder-coated aluminium housings.
- Control: DALI or programmable drivers for night-time dimming and special-occasion scenes.
Light pollution and the environment
The aim of façade lighting is to show the building, not to light the sky. When luminaires are aimed upwards, much of the light passes the façade and goes into the sky. To prevent this, light is directed only onto the surface with asymmetric optics, obstacles such as eaves are used, spill into neighbouring windows is controlled and the level is reduced after a certain hour at night.
Project steps
- Examining day and night photographs, dimensions and material of the façade.
- Deciding which elements to accent and which technique to use.
- Determining luminaire type, angle and mounting points; verification with lighting software.
- Planning wiring and mounting details so that they do not damage the building.
- Control scenes and on-site fine-tuning after commissioning.
Conclusion
Façade lighting succeeds when material, technique and optics are matched correctly. You can see examples from our mosque façade and historic building projects on our façade lighting solutions page.
Frequently Asked Questions
Which technique is used most in façade lighting?
Uniform wallwashing on flat, large surfaces, grazing light on textured surfaces such as stone and brick, and narrow-beam accents on elements such as columns and domes.
Which colour temperature should be chosen for façade lighting?
Warm 2700K–3000K tones for stone, brick and historic fabric; 4000K can be preferred for modern façades dominated by glass and metal. Coloured (RGB) effects are planned as scenes for special occasions.
Where are façade luminaires mounted?
As in-ground or wall-base luminaires at the foot of the surface, linear luminaires under the eaves, or floodlights on an opposite building or pole; the choice depends on the angle of incidence of the light and the texture of the façade.
How is light pollution prevented in façade lighting?
Asymmetric optics direct the light only onto the surface, anti-glare accessories are added to the luminaires, and programmed dimming or switching off is applied late at night.