Seamless inside and outside corner lighting: detail the corner before the drywall or tile

CHECKPOINT / 01

Name the corner and the finished plane

An inside corner is a recessed intersection such as wall-to-wall or wall-to-ceiling; an outside corner projects into the room and is exposed to knocks and visual grazing. The profile shape, flange, diffuser and finish build-up differ between drywall, plaster and tile. Draw the finished planes, not only the structural corner, so the light line lands at the intended depth and angle.

• Mark the final plaster, paint, tile and grout thicknesses.
• Confirm whether the profile is inside-corner or outside-corner geometry.
• Keep the diffuser face flush with the intended finished plane.

CHECKPOINT / 02

Choose a corner profile as a mechanical assembly

A corner profile combines a carrier, diffuser, mounting method and sometimes a reinforcing or finishing edge. Check its inner width, bend or joint strategy, end caps and how the profile meets the straight sections. A profile that looks seamless in a catalogue can still create a visible break if the diffuser, strip density or corner cut is inconsistent. Approve a short corner sample before the trade fixes the surrounding material.

• Match the strip width and height to the channel cavity.
• Plan straight-to-corner transitions and access to the cable exit.
• Do not use a straight profile forced around a sharp corner.

CHECKPOINT / 03

Detail the strip path before the finish

The strip can follow the corner only within its bend direction and minimum radius. If it cannot turn safely, cut at a valid interval and use a corner connector or soldered lead with enough pad and strain relief. For an addressable strip, preserve data direction. Keep the joint out of the highest-glare point and leave a service loop at the nearest accessible end.

• Avoid folding a flexible PCB across the corner apex.
• Label polarity, channel order or data direction on both sides.
• Keep the joint height below the diffuser clearance.

CHECKPOINT / 04

Coordinate drywall, plaster or tile sequence

A plaster-in detail may require a prepared slot, profile fixing, mesh or crack-control layer, skim coat and paint. A tile detail also depends on tile thickness, adhesive bed and edge alignment. The electrical test must happen before the final finish hides the strip, while the finish must be installed without blocking the diffuser or service access. Coordinate the profile drawing with the trade responsible for the surface.

• Fix the profile without deforming its diffuser channel.
• Protect the light cavity from plaster, adhesive, grout and paint.
• Keep end caps and the service route accessible after finishing.

CHECKPOINT / 05

Approve the line from the room, not the bench

Test the straight section, corner and next straight section together at the final CCT or color, brightness and viewing distance. Inspect the corner for a dark point, hotspot, shadow, diffuser mismatch and surface irregularity. Check voltage and temperature at the corner joint, then record the profile, strip, cut interval, connector or solder method and final finish. A seamless visual result needs a repeatable installation record.

corner_path = straight_a + turn + straight_b
optical_check = no_hotspot && diffuser_continuity
service_check = joint_access && end_access

FAILURE MODES

What usually goes wrong

• Inside and outside corner profiles are treated as interchangeable.
• The finished plaster or tile thickness is ignored until the diffuser sits proud of the wall.
• The strip is folded at the corner and the PCB or solder pads are damaged.
• Plaster, grout or paint enters the channel and prevents the diffuser from seating.
• The straight run looks correct on a bench but the corner is not tested from the room sightline.

TECHNICAL BASIS / VERSION

Keep the decision current

This guide is maintained as a versioned technical record. Recheck the current protocol documentation and the exact product revision before using it in a production installation.