Description
The STL-133 is a mud-in aluminum LED channel designed for seamless drywall and plaster installations, sold in a 5-pack. Each 39-inch channel features wide perforated flanges that embed directly into joint compound, leaving only the frosted polycarbonate diffuser visible for a clean, trimless light line flush with the finished surface. Constructed from 6063-T5 aluminum with an inner channel width of 0.74 inches, the STL-133 accommodates LED strips up to 18mm wide and maintains approximately 78% light transmittance through its frosted diffuser.
Specifications +
| General | |
|---|---|
| Model | STL-133 |
| Sold As | 5-Pack |
| Profile Type | Mud-In / Drywall Recessed |
| Finish | Silver |
| Material | 6063-T5 Aluminum |
| Physical | |
| Length | 39" (1m) |
| Overall Flange Width | 2.39" (61mm) |
| Outer Channel Width | 1.11" (28mm) |
| Inner Channel Width | 0.74" (19mm) |
| Height / Depth | 0.94" (24mm) |
| Cuttable | Yes — cut to length with fine-tooth saw |
| Optical | |
| Diffuser Type | Frosted (Milky White) |
| Diffuser Material | Polycarbonate |
| Light Transmittance | ~78% |
| Max LED Strip Width | 18mm |
| Installation | |
| Mounting Method | Mud-in — embed flanges in joint compound or plaster |
| IP Rating | IP20 |
| Environment | Dry / Indoor |
| Accessories Included | None — diffuser included, no end caps or clips |
Features +
- The mud-in profile is designed to be embedded directly into drywall or plaster, producing a seamless, trimless light line that sits perfectly flush with the finished surface.
- Wide perforated flanges spanning 2.39 inches provide a strong mechanical bond with joint compound, ensuring the channel stays securely anchored after the wall or ceiling is finished.
- The inner channel width of 0.74 inches accommodates LED strips up to 18mm wide, supporting single-color, tunable-white, RGB, and RGBW strip products.
- Extruded from 6063-T5 aluminum, the channel body dissipates heat effectively to help preserve LED strip lifespan while fully concealing the strip within the wall or ceiling assembly.
- The frosted polycarbonate diffuser snaps into the channel and softens individual LED points into a smooth, continuous line of light with approximately 78% transmittance.
- Each channel can be cut to any custom length using a standard fine-tooth hacksaw or miter saw, and multiple channels can be aligned end-to-end for continuous runs across longer spans.
- The 0.94-inch channel depth provides adequate clearance for strip tape and wiring without requiring excessive wall cavity space.
- No end caps or mounting clips are included since the flanges are fully concealed under compound — the finished installation exposes only the diffuser lens.
- Rated IP20 for dry indoor environments and suitable for new construction or remodel projects where drywall is being hung or re-finished.
Applications +
- Wall wash and perimeter lighting in living rooms, bedrooms, and lobbies for a clean architectural light line
- Ceiling cove details where a flush, trimless appearance is required by the design specification
- Hallway and corridor accent lighting recessed into drywall walls or ceilings for wayfinding and ambiance
- Hospitality and hotel room headboard walls where concealed lighting creates a modern, layered effect
- Retail environments and showrooms where recessed linear lighting highlights merchandise without visible hardware
- Restaurant and bar interiors with plaster or drywall finishes that call for integrated architectural lighting
- Custom residential new construction and remodel projects where the lighting channel is installed before drywall finishing
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