How to Install LED Strip Lights: Profiles, Corners and Coves

By DENO LED Lighting · 2026-08-04

A repeatable installation method for architectural LED strip lights: surface prep, profile selection, corner handling, and the cove geometry that removes visible dots.

Most disappointing LED strip installations are not caused by the strip. They are caused by the surface it was stuck to, the corner it was folded around, and the cove it was hidden in.

1. Prepare the surface

3M adhesive needs a clean, dry, non-porous surface above 15°C. Degrease with isopropyl alcohol and let it flash off. On raw plaster, timber or powder coat, the adhesive alone will fail within a season — always use a mechanical carrier.

2. Always use a profile

An aluminium LED profile does three jobs at once: it heat-sinks the strip, it holds it mechanically, and its diffuser turns a row of points into a line of light. For a recessed detail, use a plaster-in profile; for a shelf or handrail, a surface profile with a frosted lens.

3. Plan the corners before you cut

Do not fold a standard strip through 90°. A sharp fold cracks the copper trace and creates a hot spot that fails months later. Instead:

Use a corner connector or two mitred profile sections with a short jumper wire; or
Specify an S-bend LED strip light, whose serpentine FPCB is designed to turn in-plane without stressing the trace.

4. Get the cove geometry right

Dot-free output is a function of four things: LED pitch, the distance from strip to diffuser, diffuser transmittance, and beam angle. As a starting point, keep the strip at least 15mm behind the diffuser for a standard 120-LED/m strip, or move to an ultra-density LED strip light when the cavity is shallower than that.

Where the light has to leave the profile sideways — under a nosing, inside a slot, along a reveal — use a side-emitting LED strip light rather than tilting a top-emitting strip.

5. Terminate and test

Solder the feeds, seal any cut ends on IP-rated product, then power the run on the bench before it disappears into the ceiling. Confirm run length and feed points first with our voltage-drop calculator.

Need the detail drawing?

Send us the section and we will return a profile, diffuser and strip combination from the LED strip light catalogue that suits the cavity you actually have.

Frequently asked questions

What considerations are critical for surface preparation before LED strip installation?

Proper surface preparation is essential for secure adhesion and heat dissipation. Surfaces must be clean, dry, and free of dust, grease, or residue. For optimal thermal management and protection, especially with higher wattage strips, installation within an LED aluminium profile is recommended. This also ensures a flat mounting surface and prevents adhesive degradation over time.

How do you achieve seamless lighting around corners and S-bends with LED strips?

For corners, pre-fabricated L-connectors or precise cutting and soldering can be used. For S-bends, specialized flexible LED strips designed for lateral bending are available. DENO's electroplated roll-to-roll FPCB technology allows for enhanced flexibility. Proper planning of the LED strip's path and ensuring the bend radius is within the manufacturer's specifications are critical to prevent damage and maintain optical uniformity.

What is the recommended cove depth to eliminate visible LED dots when installing LED strip lights?

To achieve a dot-free, continuous line of light, the optimal cove depth typically ranges from 75mm to 150mm, depending on the LED pitch and the viewing angle. Utilizing LED strips with higher LED density, such as SCOB technology, or incorporating frosted diffusers within an aluminium profile can further minimize visible dots, creating a more uniform illumination.

What are the common issues related to voltage drop in longer LED strip runs and how are they mitigated?

Voltage drop manifests as a decrease in brightness along the length of an LED strip, particularly noticeable on longer runs or with thinner gauge wiring. Mitigation strategies include using shorter individual runs powered in parallel, employing thicker gauge wiring, or utilizing constant current LED strips. Specifying 24V systems over 12V also inherently reduces voltage drop over the same distance.