• 22 Oct 2026

LED Linear Lights for Building Facades: When to Choose Linear Over Wall Washers

Ask a facade lighting supplier for "something for the front of a hotel" and you will usually be offered two different tools: wall washers and linear lights. They are often quoted against each other as if interchangeable, but they produce different effects, fail in different ways, and on a real building one is usually clearly right while the other is a compromise. Wall washers throw light across a surface — an even wash, a grazing highlight, or broad coverage from a setback. Linear fixtures draw with light itself: continuous lines that trace cornices, outline towers and turn rooflines into geometry. Choosing correctly starts with the picture you want, and finishes with some unglamorous engineering: joints, drivers and voltage drop.

The Visual Difference: Washing a Surface vs Drawing a Line

A wall washer is a floodlight with manners. Mounted at ground level, in a trench, or on a bracket at a set distance from the wall, it spreads a controlled beam up or across the facade. Grazed at a shallow angle from close to the wall, it rakes across stone, concrete or cladding and exposes every texture and relief. Set further back with a wider beam, it gives the smooth, even coverage that hotel and office towers usually want — the building reads as a softly lit volume.

A linear fixture works the opposite way. The fixture is the visible element: a slim aluminium profile, typically mounted directly on the surface or recessed into it, emitting a continuous line of light along an edge, a fin, a cornice or a floor line. Instead of lighting the wall, it draws the building's own lines in light, so the architecture reads after dark as drawn in elevation. Run in RGB or RGBW with segmented control, those lines can also chase, fade and carry media content — a wall washer can change colour, but it cannot draw.

One consequence matters in practice: overlapping washer beams forgive small brightness differences between fixtures. A continuous line does not — every joint, brightness step and gap in a run is visible from across the street, which is why linear projects are won or lost on installation engineering, not the fixture.

When Linear Is the Right Choice

Choose linear fixtures when the design intent is the line itself:

• Long continuous edges. Cornices, rooflines, parapets, podium edges and bridge decks that run unbroken for tens of metres are linear's home ground. Washers can light the wall below a cornice; only a linear run puts a crisp line of light on it.

• Low mounting heights. Where fixtures sit at eye level — podiums, entrances, colonnades, retail frontages — a slim profile is discreet, while a washer in the same position is a bulky, glare-prone object.

• Narrow setbacks. Washers need throw distance for their beam to develop and even out. In tight courtyards, light wells and narrow streets there may be less than a metre between fixture and wall; a linear fixture grazing along the surface needs almost no setback.

• Segmented colour and movement. If the facade needs zones of colour, chasing effects or content that follows the building's bays and floor lines, linear runs divided into DMX segments deliver it naturally.

• Coves and recessed details. Linear profiles disappear into slots, reveals and shadow gaps, lighting details no surface-mounted washer can reach without showing itself.

When Wall Washers Win

Choose washers when the intent is the surface:

• Large flat areas. A tower's main elevation, a warehouse wall, a stadium facade — covering hundreds of square metres evenly is what washers exist for. Linear would merely outline a surface that wanted to be lit.

• Height and distance. The taller the facade, the more a washer's optical power matters; tall buildings are usually washed, then accented — not lined top to bottom.

• Cost per square metre lit. One washer covers a wide area from a single mounting and connection point. A linear run is priced by the metre and needs a connection, a joint and a driver allocation for every section — on a big plain facade the washer scheme is almost always cheaper.

• Simpler maintenance. Fewer fixtures and fewer joints mean fewer seals, connectors and addressing points to fail or service.

Many strong facades use both: washers for the field of the wall, linear for its defining lines. If budget forces one system, let the dominant surface decide — big and flat means wash, edges and detail mean linear. The washer side of this comparison is covered by our LED wall washer lights range, and for very large surfaces LED flood lights take over from washers altogether.

Specifying Linear Facade Runs: The Engineering That Matters

A linear specification is a system specification. These are the points that decide whether the finished run looks continuous or patched together:

Section lengths and joints. Profiles come in standard section lengths that are butt-jointed on site. Every joint is a potential light leak, a visible dark gap, or a small step between sections. Specify how sections join (mechanical couplers, sealed end-to-end connectors), inspect a sample joint, and plan section lengths around the building's module — bay widths and floor heights — so joints land where the eye expects a break.

End caps and corners. Runs end and turn. End caps must seal the profile without shadowing the last LEDs, and corners need corner pieces or mitred sections: a run that stops short of a corner and restarts after it reads as a mistake from the ground. Walk every run end to end on the drawing before ordering, and count terminations and turns as orderable parts, not afterthoughts.

DMX segmentation and addressing. For dynamic facades, what matters is not just "DMX" but the segment: how many independently controlled sections exist per metre. A fixture controlled as one segment per metre can fade and chase in metre steps; finer segments give smoother gradients and higher-resolution effects at the cost of more channels. Each RGBW segment consumes four DMX channels, and a DMX universe carries 512 — so a long, fine-segmented run consumes universes quickly and needs a controller and data plan (Art-Net or sACN above a few universes, repeaters on long data chains). Agree segment length, channel count per run and who produces the addressing map before production; on large runs, prefer RDM or auto-addressing fixtures to speed commissioning.

Drivers and voltage drop on 24 V runs. This is the most common technical failure in linear projects. A 24 V run fed from one end loses voltage along its length, so the far end runs dimmer and — on RGBW — shifts colour as the channels drop unevenly. The standard mitigations are well established: feed the run from both ends, or centre-feed it, so no point is far from a feed; break very long lines into shorter home runs wired in parallel, each with its own feed from the driver; use adequately sized DC cable; and where runs are genuinely long, consider higher-voltage (for example 48 V) or constant-current linear systems, which carry the same power at lower current and drop less. Where drivers live matters too: remote drivers in an accessible cabinet are serviceable; drivers buried behind cladding are not. Record the maximum single-feed run length the supplier guarantees, in writing, and hold the sample test to it.

IP rating and mounting. Specify the ingress rating for the actual exposure — driving rain on an exposed parapet is a harsher duty than a sheltered cove — and check how the rating survives the joints and cable entries, not just the bare profile. Surface-mounted profiles need a bracket system that allows thermal movement and later removal; recessed channels need drainage, because a channel that collects water eventually tests every seal. In both cases the aluminium profile is also the heatsink: undersized profiles run hot, and heat shortens LED and driver life — a profile that looks slim in a catalogue photo should still have the mass to shed its heat.

Decision Checklist: Linear, Washer, or Both?

Either way, hold to one pre-order discipline: a sample of the actual run — including a joint and a corner — tested at full length on its real driver and controller will show you the brightness fall-off, the joint quality and the colour consistency that no catalogue photograph can.

Send Us the Building, Not Just the Bill of Quantities

If you are deciding between linear runs, wall washers, or a mix for a facade, send Always Lighting the drawings or photographs of the building through the WhatsApp or email buttons on this site. The right choice depends on the actual setbacks, surfaces and sight lines, and the lighting approach can be worked out against the real building before any quotation is prepared. Our wall washer range covers the wash side of that conversation, and the linear side can be scoped from the same drawings.