Architectural 3mm Ultra-Narrow COB LED Strip | 480 LEDs/m Precision Lighting

Technical Specifications

Ultra-Slim Architectural Features

The 3mm Architectural Series redefines invisible lighting. At just 3 millimetres wide, the strip disappears into the tightest cabinet grooves, door reveals and joinery channels, leaving the architecture itself as the only visible design element. The 480 LEDs/m chip-on-board construction delivers a perfectly seamless, dot-free light line with no visible light source — the defining quality of architectural-grade illumination. Every design detail serves the pursuit of invisibility: the ultra-thin profile fits standard 3-4mm CNC grooves, the matte black PCB blends into dark interiors, and the flexible substrate follows curved joinery without stress. For luxury furniture brands, interior designers and architects, this strip is the difference between a visible fixture and a pure architectural light effect.

Premium 2oz Copper Advantage

Beneath the 3mm profile lies engineering that separates architectural lighting from decorative lighting: a professional double-sided 2oz (35um) copper PCB. The double-sided construction doubles the conductive cross-section per metre, cutting resistive losses and enabling uniform brightness across the full run length. The 2oz copper layer acts as a lateral heat spreader, distributing the heat of 480 chips evenly so the strip stays cool inside enclosed timber and MDF structures — protecting both the LEDs and the joinery. The 35um copper also reinforces the substrate, so the narrow 3mm PCB remains dimensionally stable during cutting, bending and long-term thermal cycling. This is why the 3mm Architectural Series is specified for projects where reliability must match the aesthetics.

Luxury Cabinet Applications

Engineered for the world's finest cabinetry, the 3mm strip fits CNC-routed grooves as slim as 3-4mm — slots that standard strips simply cannot enter. In walk-in wardrobes, run it along shelf noses and frame reveals for a floating light effect that silhouettes garments with museum-grade precision. In kitchens, install it into toe-kick channels and under-fascia grooves for soft architectural grazing light. For display cabinetry, jewellery cases and retail joinery, the ultra-narrow profile lights glass shelves and interiors without any visible fixture. Because the strip is fully cuttable at 25mm (DC12V) or 50mm (DC24V) marks, every run is tailored to exact cabinet dimensions, and offcuts remain usable on the next project — eliminating waste on high-end installations.

Precision Installation Guide

Installing a 3mm strip demands precision — and the design makes it effortless. (1) Cut at the marked 25mm (DC12V) or 50mm (DC24V) points with sharp scissors; offcuts remain functional. (2) Clean the 3-4mm groove with isopropyl alcohol and allow full drying. (3) Press the 3M 300LSE adhesive evenly with a soft roller, eliminating air pockets for full contact. (4) In narrow spaces, use solderless clamp connectors or solder directly to the exposed copper pads at cut ends — the double-sided copper makes soldering reliable even at 3mm width. (5) Feed from both ends for runs above 5m at DC12V or 8m at DC24V. (6) Size the driver at 1.2x total wattage (metres x 5W/m). (7) Maintain a 20mm minimum bend radius and use corner connectors for sharp 90° turns in joinery.

Professional Sourcing FAQ

1. What defines the 3mm Architectural Series?

It is an ultra-narrow 3mm-wide COB strip engineered for invisible integration into luxury cabinetry and joinery, with 480 LEDs/m dot-free output, 5W/m efficiency, CRI > 90 and a professional double-sided 2oz (35um) copper PCB.

2. Why is 480 LEDs/m density essential at 3mm width?

At 3mm the light source sits extremely close to the emitting surface, so any gap between chips becomes visible. 480 LEDs/m keeps the pitch below the visual threshold, delivering a continuous light line even in open grooves without a diffuser.

3. How does the 5W/m rating protect enclosed joinery?

The low 5W/m load keeps junction temperatures modest inside enclosed timber, MDF and acrylic structures, protecting the LEDs and the surrounding millwork. The double-sided 2oz copper further spreads heat for uniform thermal performance.

4. What are the cutting rules for the 3mm strip?

Cutting Unit is 25mm for DC12V and 50mm for DC24V, with cutting marks clearly indicated on the strip. Cut only at the marked points with sharp scissors; offcuts remain fully functional and connectable.

5. Which voltage should I select?

Choose DC24V for runs above 5m and thinner supply wiring; choose DC12V for short runs and the finer 25mm cutting granularity. Always match the driver voltage to the strip voltage.

6. What power supply do I need?

Total wattage equals metres x 5W/m plus 20% headroom. A 10m run needs a 60W certified constant-voltage driver. For dimming, select a driver supporting PWM, TRIAC, 0-10V or DALI protocols as required.

7. Is the CRI consistent between batches?

Yes. Chips are binned before production and every batch is tested for luminous flux, CCT and CRI, holding CCT within ±50K and CRI within ±1 at the same bin code, so multiple reels match seamlessly.

8. What is the expected lifespan?

50,000 hours (L70) at rated voltage with correct mounting. The 5W/m load and double-sided copper keep junction temperatures low, preserving output and color stability over the strip's working life.

9. Does the strip work in mirror and glass applications?

Yes — the 480 LEDs/m COB construction reads as a continuous light line in mirror reflections, glass shelves and polished surfaces with zero visible dots, ideal for luxury vanity and display cabinetry.

10. Is the strip dimmable?

Yes — 0-100% with PWM dimmers (2kHz+ recommended for flicker-free camera output), TRIAC with a compatible dimmable driver, or 0-10V/DALI converters matched to the strip voltage.

11. How small is the minimum bending radius?

Approximately 20mm. For sharp 90° corners in joinery, cut at a marked point and join with a corner connector instead of bending the PCB sharply.

12. What makes the double-sided 2oz copper PCB superior?

Double-sided 2oz (35um) copper doubles the conductive cross-section, reducing voltage drop, improving heat spreading and boosting long-term reliability — essential for continuous 480 LEDs/m operation in tight enclosures.

13. Can the strip be used with smart control systems?

Yes. The low-current profile integrates with presence sensors, daylight sensors and app-controlled PWM dimming hubs. Integration guidance and wiring diagrams are provided free.

14. Is a waterproof version available?

The standard version is IP20 for dry indoor use. Custom IP65 silicone-extruded versions are available for bulk orders requiring moisture resistance.

15. What is the minimum order quantity for wholesale?

Standard MOQ is 50 reels (500m) with sample reels dispatched within 24-48 hours. Trial and stocking orders can be arranged with our sales team.

16. What OEM customization options are available?

Custom CCT (2200K-6500K), custom CRI grades (90/95/97), custom length and reel size, private-label printing, custom connectors and bespoke packaging — with full technical documentation.

17. How does the 3mm strip behave in furniture slotting?

It fits CNC grooves as slim as 3-4mm, trimming to exact dimensions on site with no waste. The ultra-narrow profile suits standard joinery machinery and retrofit upgrades.

18. Which certifications apply to the series?

Strips are manufactured to CE, RoHS and UL-relevant requirements, with batch test reports covering luminous flux, CCT and CRI available on request.

19. How should the strip be stored before installation?

Store reels in original packaging at room temperature and low humidity. Unroll only the required length and avoid tight coils for extended periods to preserve PCB and adhesive integrity.

20. Can the strip be joined end-to-end?

Yes. Cut at the marked point, seal the end, and join with solderless connectors or soldered links at the copper pads. Joined sections maintain full brightness with matched bin codes.

21. Why choose LEDLetsGo for the 3mm Architectural Series?

LEDLetsGo combines in-house COB manufacturing, strict binning and batch testing, flexible MOQ, fast lead times and dedicated engineering support — a complete sourcing partner for furniture brands and lighting distributors.

22. What is the difference between the 3mm and standard strips?

The 3mm Architectural Series is engineered specifically for ultra-narrow invisible integration, with the same 480 LEDs/m density and dot-free performance in a form factor that fits 3-4mm grooves where standard widths cannot enter.

Engineering Notes: The Architecture of Invisible Light

Three engineering decisions make the 3mm strip architecturally distinct. First, the 480 LEDs/m COB density eliminates any visible dot pitch even in open grooves, which is the fundamental requirement for invisible light lines. Second, the double-sided 2oz (35um) copper PCB provides the electrical and thermal backbone for reliable long-run operation at 5W/m — the ultra-low power density keeps enclosed timber joinery safe while maintaining full luminous output. Third, the 25mm/50mm cutting units (DC12V/DC24V) allow millimetre-precise tailoring to cabinet dimensions, ensuring every installation is waste-free. Together, these choices allow designers to treat light as a material of architecture — present in effect, absent in fixture.

23. How does the 3mm strip support sustainable installation?

Precision cutting at 25mm/50mm units plus functional offcuts means joinery workshops use every metre of every reel, eliminating scrap and reducing material waste across large furniture programs — an increasingly important criterion for sustainable building certification.