How to Choose a Stretch Ceiling Profile: Selection Guide
Profile selection guide for stretch ceilings: decision criteria (mounting method, room height, membrane
06.04.2026 | Installation Guides, LED Lighting, Profiles for Stretch Ceilings
LED Profiles for Plasterboard: GK LINE IN Series [Installation Guide]
LED profiles for plasterboard (drywall) are aluminium mounting channels designed to be recessed into gypsum board ceilings and walls. The GK LINE IN series includes two models: GK LINE IN 20 (20 mm light slot) and GK LINE IN 30 (30 mm light slot). Profiles are installed during the drywall construction phase and produce a flush LED light line level with the ceiling or wall surface. The aluminium housing dissipates heat from the LED strip, extending its lifespan by 30-50%. Both models use anodised aluminium and accept 24V DC LED strips with snap-in frosted diffusers.
LED profiles for plasterboard (also known as drywall or gypsum board) allow you to create seamless, flush-mounted light lines in suspended ceilings and wall constructions. Unlike surface-mounted profiles, plasterboard LED profiles are completely hidden inside the drywall — only the diffuser slot remains visible. This article covers the GK LINE IN series from 2K-Trade, including technical specifications, installation steps, and compatible LED strip types.
What are LED profiles for plasterboard
LED profiles for plasterboard are aluminium extrusions designed to be recessed into gypsum board constructions. Once installed, the profile body is invisible — only the light slot with its frosted diffuser is visible, emitting a clean line of light flush with the ceiling or wall surface. There are no protruding elements.
These profiles are used in modern interior and architectural projects where lighting is integrated into the building structure. 2K-Trade offers the GK LINE IN series, engineered specifically for drywall systems with standard 12.5 mm boards.
GK LINE IN series: models and specifications
The GK LINE IN series includes two models that differ in light slot width. Both are made from anodised aluminium and designed for standard 12.5 mm plasterboard.
GK LINE IN 20
The GK LINE IN 20 is the narrower model:
- Light slot width: 20 mm
- Overall profile width: approximately 35 mm
- Depth: approximately 15 mm
- Material: anodised aluminium
- Strip compatibility: LED strips up to 15 mm wide
- Diffuser: frosted, snap-in
- Application: subtle light lines, perimeter lighting, accent illumination
The GK LINE IN 20 is ideal for projects where the light line should be subtle rather than dominant. The 20 mm slot accommodates most single-colour and CCT LED strips.
GK LINE IN 30
The GK LINE IN 30 is the wider model:
- Light slot width: 30 mm
- Overall profile width: approximately 45 mm
- Depth: approximately 15 mm
- Material: anodised aluminium
- Strip compatibility: LED strips up to 25 mm wide (including wide RGBW and COB strips)
- Diffuser: frosted, snap-in
- Application: high-intensity light lines, primary linear lighting, corridors, offices
The GK LINE IN 30 accepts wider strips such as 20 mm COB and RGBW 4-in-1 types. The wider slot delivers stronger illumination and is frequently used as the primary linear light source in a room.
Comparison: GK LINE IN 20 vs GK LINE IN 30
| Parameter | GK LINE IN 20 | GK LINE IN 30 |
|---|---|---|
| Light slot width | 20 mm | 30 mm |
| Overall width | ~35 mm | ~45 mm |
| Max LED strip width | 15 mm | 25 mm |
| Compatible strip types | Single-colour, CCT | Single-colour, CCT, RGB, RGBW, COB |
| Light intensity | Subtle | Intensive |
| Typical use | Accents, perimeter | Primary linear lighting |
How to install GK LINE IN profiles in plasterboard
GK LINE IN profiles must be planned into the drywall construction from the start. The profile is fitted before plastering and painting.
Step 1: Plan the profile route
Determine where the light line will run on the ceiling or wall. Profiles can be installed in straight lines, at 90-degree angles (with mitre cuts), or in curves (with appropriate bending). Plan the cable exit point for the LED power supply.
Step 2: Cut the slot in the plasterboard
Cut a slot in the plasterboard matching the profile width (35 mm for GK LINE IN 20, 45 mm for GK LINE IN 30). The slot must be straight and even along its entire length. Use a hand router with a guide fence or an oscillating multi-tool for best results.
Step 3: Mount the profile
Set the profile into the slot and fasten it to the metal substructure (CD/UD profiles) using screws or mounting clips. The top edge of the profile must be flush with the plasterboard surface. After fixing, fill the joint between the profile and the board with plaster compound.
Step 4: Install the LED strip and diffuser
After finishing works (plastering, painting), stick the LED strip into the profile channel and snap in the frosted diffuser. Connect the cables to a 24V DC power supply and controller (if required).
Advantages of GK LINE IN profiles over alternatives
GK LINE IN profiles offer several important advantages over other methods of installing LED lighting in plasterboard:
- Heat dissipation — the aluminium profile draws heat away from the LED strip, extending its lifespan by 30-50% compared with strips mounted directly on plasterboard.
- Mechanical protection — the profile shields the strip from damage during finishing works and everyday use.
- Strip replacement — if the strip fails, remove the snap-in diffuser, replace the strip, and snap the diffuser back in. No need to disturb the drywall.
- Uniform light — the frosted diffuser eliminates visible LED dots, producing an even, continuous line of light.
- Clean aesthetics — the profile is completely hidden in the construction. Only the diffuser slot is visible, delivering a minimalist finish.
Compatible LED strips
GK LINE IN profiles work with 24V DC LED strips. The choice depends on the required brightness and function:
- Decorative accent — SMD 2835 strip, 60-120 LED/m, 4.8-9.6 W/m. Colour temperature 3000 K.
- Functional lighting — SMD 2835 Hi-Eff strip, 140-192 LED/m, 14-20 W/m. Suitable for corridors and offices.
- Premium uniform light — COB strip, 320-608 LED/m, 10-16 W/m. Continuous light line with no visible dots.
- Colour change — RGB or RGBW strip, up to 25 mm wide. Requires GK LINE IN 30 profile.
- Tuneable white — CCT strip, 2700-6500 K. Controlled via CCT controller.
Browse the full LED strip catalogue at 2K-Trade.
Frequently asked questions
Can GK LINE IN profiles be installed in suspended ceilings?
Yes. GK LINE IN profiles are designed for plasterboard constructions, including suspended ceilings. The profile is recessed into the board and fastened to the ceiling substructure (CD 60 profiles). Installation works in both flat ceilings and ceilings with lowered segments.
What is the maximum length of a GK LINE IN profile?
GK LINE IN profiles are supplied in 2 m sections. Longer light lines are achieved by joining sections end-to-end. The joint must be straight and precise so the diffuser passes smoothly between sections without a visible gap.
Can GK LINE IN profiles be used in bathrooms?
The aluminium profile itself is moisture-resistant and suitable for bathroom installation. However, the LED strip must have a minimum IP44 rating (ideally IP65). The installation zone (distance from water sources) must comply with applicable electrical regulations (EN 60364-7-701).
What is the difference between GK LINE IN and GAMMA profiles?
GAMMA profiles (e.g. GAMMA 20, GAMMA 50) are designed for stretch ceilings — they mount to walls or the structural ceiling and do not require plasterboard. GK LINE IN profiles are recessed directly into the plasterboard. Choose based on ceiling type: stretch ceiling = GAMMA, plasterboard ceiling = GK LINE IN.
Can the LED strip in a GK LINE IN profile be replaced without dismantling the ceiling?
Yes. The diffuser is held by snap-fit clips and can be removed by hand. Once the diffuser is off, the LED strip is accessible for replacement. There is no need to dismantle the drywall or re-plaster the joint.
