DENO LED Lighting

LED Strip Technology — R2R FPCB, SOB, LED Chip | DENO

The DENO Technology Hub documents the three core technologies behind every DENO LED strip: Electroplated Roll-to-Roll (R2R) FPCB with 105 μm electrolytic copper for halved voltage drop, SOB (Solder-on-Board) chip packaging for dot-free continuous illumination, and 99.99% gold-wire LED chip bonding for long-term lumen stability. Each page provides manufacturing logic, measured performance data, and direct comparisons against standard market processes.

Frequently asked questions

What is the difference between SMD, SOB and COB LED strips?

SMD uses pre-packaged surface-mount LEDs soldered onto the PCB — visible dots, lowest cost. COB (Chip-on-Board) bonds bare chips directly to an aluminum or FR4 substrate and covers them with phosphor for a continuous light line. SOB (Solder-on-Board) takes COB further by soldering bare chips onto a flexible R2R FPCB with electroplated copper, combining dot-free output with full flexibility, finer pitch, and better thermal performance.

Why does DENO use 105 μm copper FPCB instead of standard 50 μm?

Resistance follows R = ρ·L/S. Doubling copper cross-section (35+70 = 105 μm vs 25+25 = 50 μm) halves resistance per metre, reducing voltage drop on long runs and giving 100% brightness consistency from first to last LED. The thicker copper also acts as a thermal spreader, lowering LED junction temperature and slowing lumen depreciation.

What is Electroplated R2R FPCB?

Electroplated Roll-to-Roll FPCB is an additive process where copper traces are grown atom-by-atom via electrochemical deposition on a continuous polyimide reel up to 100 m long. It produces molecularly smooth edges, ±10 μm trace accuracy, and 99.9% electrolytic copper purity — fundamentally different from Die-Cut R2R, which mechanically punches pre-rolled RA copper foil and leaves micro-fractures at cut edges.

Why is 99.99% gold wire bonding important for LED strips?

Gold wire bonds the LED chip to the substrate pads. 99.99% pure gold offers superior conductivity, oxidation resistance, and ductility versus copper or alloy alternatives, ensuring the bond survives thermal cycling over the 50,000+ hour LED life. Cheaper alloy wires can crack or oxidise, causing intermittent failure long before the LED chip itself degrades.

How do DENO technologies translate into better lighting projects?

Halved voltage drop means longer single-feed runs without brightness falloff. Dot-free SOB output eliminates the need for diffusers in cove and architectural lighting. Better thermal management preserves CCT consistency and CRI across the warranty period. Together, the three technologies enable single-piece seamless runs up to 100 m with stable colour and brightness — impossible with conventional Die-Cut SMD strips.