{"id":48090,"date":"2025-05-16T09:51:53","date_gmt":"2025-05-16T01:51:53","guid":{"rendered":"https:\/\/www.elstarled.com\/?p=48090"},"modified":"2026-01-08T14:10:51","modified_gmt":"2026-01-08T06:10:51","slug":"what-is-a-cob-led-strip","status":"publish","type":"post","link":"https:\/\/www.elstarled.com\/fr\/what-is-a-cob-led-strip\/","title":{"rendered":"What Is a COB LED Strip?"},"content":{"rendered":"

What COB LED Strip Lights Are<\/b><\/h2>\n

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A <\/span>Bande LED COB<\/b><\/a> uses a \u201cchip-on-board\u201d process, bonding bare LED die directly onto a flexible PCB substrate without individual plastic housings. By eliminating separate SMD packages, manufacturers achieve extremely high emitter density\u2014often 200 or more LEDs per metre\u2014resulting in a continuous, ribbon-like glow rather than discrete points of light.<\/span><\/p>\n

In place of individual LEDs, COB strips employ a uniform phosphor layer over the densely packed die. This coating diffuses the combined light output, smoothing spectral spikes and improving <\/span>color consistency<\/b> across the strip\u2019s length. Most COB constructions use flexible copper-clad PCB with an optional aluminium heat-spreader backing to enhance thermal performance for high-wattage applications.<\/span><\/p>\n

Because the LED chips sit directly on the board, heat travels efficiently from the die into the PCB and any attached heatsink. This direct thermal path reduces junction temperatures under load, extending the strip\u2019s lifespan. COB strips excel in installations that demand glare-free illumination\u2014architectural coves, retail showcases, and dynamic signage where visual uniformity is critical.<\/span><\/p>\n

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How Chip-On-Board Technology Works<\/b><\/h3>\n

In a COB strip, <\/span>individual LED<\/b> die are bonded directly onto a copper-clad flexible PCB, eliminating the need for separate SMD packages. After the bare LED chips are placed in precise locations, tiny wire bonds connect each die to copper traces. A thin layer of transparent epoxy or silicone then encapsulates the die and wires, sealing them against moisture and mechanical stress. This direct-bond construction minimizes parts count and simplifies assembly, reducing manufacturing cost per lumen.<\/span><\/p>\n

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Next, a phosphor coating\u2014often dispensed in liquid form\u2014covers the clustered die. As blue or <\/span>UV light<\/b> from the bare chips excites the phosphor, it re-emits across a broader spectrum, smoothing out color peaks and improving CRI. The phosphor thickness and composition are tuned to achieve the desired white point or color temperature. Unlike multi-LED strips that rely solely on discrete color mixing, the phosphor layer in COB strips blends light more uniformly, giving a smooth, even glow without visible color shifts.<\/span><\/p>\n

Thermally, COB technology offers a direct heat path: heat generated by the LEDs travels straight through the die into the PCB\u2019s copper layer and any attached heatsink or aluminium backing. This efficient thermal conduction keeps junction temperatures lower than in conventional SMD configurations, where heat must pass through the LED package first. The result is improved reliability and longer rated life, even at higher drive currents. In practice, I\u2019ve observed COB strips running 5 \u00b0C to 10 \u00b0C cooler at the same wattage, reducing the need for bulky heat-sink profiles.<\/span><\/p>\n

Advantages of COB vs Traditional SMD LED Strips<\/b><\/h2>\n

COB strips deliver a seamless, ribbon-like glow by packing bare LED die directly onto the PCB. With no discrete LED packages, you see no individual hotspots\u2014just a uniform line of light. The integrated phosphor coating further smooths color output and raises CRI, making COB ideal where visual consistency matters.<\/span><\/i><\/p>\n

Key Benefits<\/i><\/b><\/p>\n