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Facade Lighting: Wall Washer Placement

Wall washing looks effortless when it is right and striped when it is wrong, and the difference is almost entirely placement: setback, spacing and the match between facade height and the washer's projection distance.

Start with the wall, not the fitting

Measure three things before any model is discussed: the height of the field to be washed, the distance the fittings can stand off the wall (the setback the pavement, planting or building line allows), and the surface itself — smooth render washes evenly and shows every error, while stone and brick texture reward a grazing angle with shadow and depth. The LX-XT-001 family, the washer in this range, offers projection distances from 3M to 20M across its six variants: that ladder is the menu from which the facade height picks its variant. A 6M shopfront and a 20M tower wall are both washer jobs, but they are different variants, different beam angles and different budgets.

Setback: the quiet variable

Every metre a washer stands off its wall is a metre subtracted from vertical reach and added to evenness. Tight against the base, the beam grazes: texture pops, but the top of the wall starves and the base burns hot. Further out, the wash evens and the reach shortens. The projection distance assumes a sensible setback for the variant; when the site forces an unusual one — a narrow pavement, a deep planter — the honest move is to step one variant up the distance ladder or accept a deliberate gradient, bright at the base and falling off with height, which many facades wear well. What does not work is pretending the setback is free.

Spacing and the stripe test

Sections butt together into a run — the LX-XT-001 body is a metre class fitting with 600mm-1000mm lengths — and the run's evenness is decided by how the beams overlap at the wall. Wide beam angles (the family lists up to 120°) forgive wide spacing; narrow angles stripe unless the sections nearly touch. The practical test costs one evening: rig one bay at the real setback, at night, and read the wall. Striping, a hot base or a dark crown are all visible at bay scale and all fixable on paper — by spacing, variant or angle — before the full run is ordered. Skipping the mock-up to save a week is how a facade ends up re-aimed from a cherry picker at ten times the price.

Colour and control at facade scale

The family's variant structure splits between RGB arrangements (12R12G12B, 8R8G8B, 6R6G6B LED groups) under DMX512 control and single-colour variants in warm, pure or cool white bands. A corporate facade that changes colour for events is a DMX project with an addressing plan; a stone civic building in permanent warm white is an on-off project with a timer. Decide which building you have before the variant letter is chosen, because the control method ships with the fitting. Glare deserves a sentence of its own: a washer at a pavement edge shines into pedestrians' eyes as much as onto the wall, and shielding, aiming and the wide-angle variants are the tools that keep a well-washed wall from becoming a badly-mannered one.

The variant data behind this article is on the LX-XT-001 page, the distance ladder is worked through in the projection distance guide, and the parent category is LED wall washers.

Reading a facade before washing it

Walk the elevation at night with the existing light — streetlight, spill from windows, a neighbour's sign — before placing a single washer. A facade is never washed onto a blank field; it is washed into an existing nightscape, and placement that ignores the neighbours produces a wall that is technically even and visually lost. Note the dark zones and the bright intrusions, decide which surfaces are yours to light and which are better left as contrast, and only then open the variant ladder. The best-placed washer on the wrong wall is still the wrong wall.

Ground truth: the pavement is a drawing board

Chalk is the washer designer's oldest tool. Mark the fitting line on the pavement at the intended setback, mark the section joints against the building's own joints, and stand across the street at the audience's distance. From there the questions answer themselves in order: does the line sit comfortably in the pavement's geometry, or does it fight every drain cover and tree pit? Do the sections land on the pilasters or straddle them? Can a vehicle, a cleaner, a market stall reach the line — and if so, what protects it? Placement is a ground decision before it is a lighting decision, and the ground is available for inspection every day, unlike the finished effect, which exists only after the order.

The crown and the plinth

Two zones defeat more washes than any mid-field. The crown: the top metre of a wall, where the beam is at its weakest and a parapet or cornice throws its shadow — the zone the audience reads as the building's silhouette, and the zone a marginal variant quietly abandons. The plinth: the bottom metre, where the beam is at its strongest, where every splash of mud and every leaf shows lit, and where a hot base makes the whole wall feel like it is melting upward. Placement answers both: margin in the variant choice for the crown, restraint in aiming and output for the plinth, and a mock-up that is judged at the extremes of the wall, not at its comfortable middle.

Placement is a maintenance decision too

A washer line at a pavement edge lives where the city happens to it: pressure washers, delivery trolleys, snow and grit in colder climates, the occasional bicycle. Placement that looks perfect in section can still be wrong in the diary — fittings that cannot be reached for cleaning without closing the pavement will be cleaned late, and a dirty lens taxes every figure in the projection ladder. Leave the line accessible, keep its aiming adjustable after the cleaners have passed, and write the cleaning of the washer line into the building's exterior rhythm alongside the glass. Light that is placed to be maintained is light that still performs in year five; the rest is opening-night architecture.

One elevation, walked through

Bring the pieces together on a single imaginary building: a nine-metre stone elevation over a two-metre pavement, pilasters every four metres, a sign band at three metres, offices behind glass above. The reading: mid-ladder variants for the main field, chosen for the nine metres with setback margin; spacing that lands section joints on the pilasters; the sign band as its own field with the short-reach variant; a night mock-up of the middle bay, judged at the crown and the plinth before the run is ordered; the line set where the cleaners can reach it. Nothing in that paragraph is exotic, and every clause came from a decision this article has already made. That is what placement means in practice — not a talent, but a sequence, walked in order, on the actual ground.