What is the standard spacing rule for wall lights on a long wall?
The standard rule is to space wall lights 150–200cm apart, adjusting closer together for dimmer bulbs or wider apart for higher-output fittings.
The 150–200cm spacing rule applies to most residential corridors, hallways, and living room walls in the UK. It is derived from the typical beam spread of a 5–8W LED wall fitting, which illuminates roughly 75–100cm either side of the fitting before light levels drop noticeably.
For a long wall — anything over 4 metres — start by marking your first and last fitting positions roughly 60–80cm in from each end. This prevents the run from looking like it starts and stops abruptly. Divide the remaining wall length by your chosen interval (150cm is a safe default) to find how many fittings you need.
Up-and-down wall lights, such as the Eros Wall Light, 2 Lamp Up And Down, Brass, Glass, project light both above and below the fitting, which widens the effective spread and allows you to push spacing towards the 200cm end of the range without creating dark patches.
Decorative wall lights used for ambient rather than task lighting can be spaced more generously — up to 250cm — provided the room has additional ceiling or floor lighting to fill the gaps. When planning your layout, it helps to look at a range of wall lights with different beam angles before committing to a spacing interval, since the fitting's optics matter as much as the wattage.
How high should wall lights be mounted on a long wall?
Mount wall lights 150–170cm from the finished floor level; this puts the fitting at eye height and avoids glare when walking past the fitting.
The 150–170cm mounting height is a practical consensus across UK interior designers and electricians. At this height, the fitting sits just above eye level for most adults, which means the light source itself is not directly in the line of sight and glare is minimised.
For hallways and corridors where people walk close to the wall, the lower end of the range (150cm) is preferable — it keeps the fitting out of reach of children while still feeling proportionate. In a large living room or dining room where the wall is viewed from a distance, mounting at 160–170cm gives the fittings more visual presence.
Ceilings below 2.4 metres may require dropping to 140cm to maintain adequate clearance above the fitting and avoid the light looking cramped against the ceiling. Ceilings above 3 metres can support mounting at up to 180cm, though anything higher than that tends to feel disconnected from the room's activity zone.
Always mark all positions on the wall with masking tape before any drilling begins. Stand back and view the tape marks from the room's natural entry point — this is the perspective most visitors will have, and it reveals asymmetries that a tape measure alone will not catch. Consistency across the full run is more important than hitting an exact centimetre; a 5cm variation between fittings will read as a mistake, whereas a deliberate uniform height of 155cm throughout looks intentional.
How do you calculate how many wall lights you need for a long wall?
Divide the usable wall length by your chosen spacing interval, then add one — this gives the total number of fittings needed for even coverage.
The formula is straightforward: subtract the two end offsets (typically 60–80cm each) from the total wall length to get the usable run, then divide by your spacing interval and add one.
Example: a 6-metre wall with 70cm end offsets gives a usable run of 4.6 metres. At 150cm spacing, that is 4.6 ÷ 1.5 = 3.07, rounded to 3 intervals, meaning 4 fittings. At 180cm spacing it becomes 4.6 ÷ 1.8 = 2.56, rounded to 3 intervals, meaning 4 fittings again — so in this case either spacing works with the same number of units.
When the maths produces a fractional result, always round to the nearest whole number of intervals and then recalculate the actual spacing to distribute fittings evenly. For instance, if 3 intervals across 4.6 metres gives a true spacing of 153cm, that is perfectly acceptable and far better than forcing an uneven gap at one end.
Before finalising the count, check the electrical implications. Each additional fitting adds load to the circuit, and in older properties the existing wiring may limit how many fittings can be added without an upgrade. The Wiring Regulations guidance from Electrical Safety First outlines what constitutes a notifiable installation, which is relevant if you are adding multiple new lighting points to a circuit.
Does the type of wall light affect the spacing you should use?
Yes — directional fittings need closer spacing than diffused or up-down types, since their narrower beam creates darker zones between each fitting.
Fitting type is one of the most overlooked variables in wall light spacing. A directional spotlight-style wall fitting with a 30-degree beam angle will illuminate a tight column of wall and floor, leaving the areas between fittings noticeably darker. These typically need spacing of 120–150cm to maintain continuity.
Diffused fittings — those with frosted glass or fabric shades — scatter light across a wider arc, which softens the transition between fittings and allows spacing of up to 200cm. The Ares Wall Light, Brushed Brass, Glass, Crystal, 2 Light uses glass and crystal diffusion to spread light broadly, making it well suited to wider spacing on long walls.
Dome or shade-style fittings that direct light primarily downward — such as the Basic Colors Khaki Dome Wall Light — create pools of light on the floor rather than washing the wall. These work best in pairs or groups where the floor pools overlap slightly, which typically means spacing of 150–180cm.
For walls adjacent to listed buildings or in conservation areas, any external fittings may be subject to permitted development restrictions. The permitted development rights technical guidance from GOV.UK covers what external lighting changes require planning permission, which is worth checking before installation.
How do you keep wall lights visually aligned across a long wall?
Use a laser level or chalk line at your chosen mounting height across the full wall run before marking any fixing points, ensuring all fittings sit level.
Visual alignment is the difference between a professional-looking installation and one that looks rushed. Even a 2cm height variation between adjacent fittings is visible to the naked eye, particularly when the fittings are lit and casting shadows above and below them.
A rotary laser level is the most reliable tool for this task — set it to your chosen height and it projects a continuous horizontal line across the entire wall. Mark each fixing position along this line with a pencil cross. If you do not have access to a laser level, a long spirit level (at least 1.2 metres) and a chalk line will achieve the same result across short spans.
For very long walls, check the floor level first. UK homes, particularly older ones, often have floors that are not perfectly level. If the floor rises or falls across the wall's length, a line that is level in the true sense may appear to slope visually. In these cases, it is sometimes better to run the fittings parallel to the floor rather than to a true horizontal, as this looks more intentional in the finished room.
Once all positions are marked, stand at the far end of the room and sight along the wall before drilling. This perspective exaggerates any misalignment and is your last chance to correct it without making holes. Take photographs at this stage — they are useful for the electrician and serve as a record of cable routing positions behind the wall.