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COB Heat Sink

COB Heat Sink Manufacturing

Precision-engineered thermal solutions for Chip-on-Board LED technology. Our COB heat sinks deliver superior cooling for high-density LED arrays in lighting, grow light, and display applications demanding maximum thermal performance.

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Understanding COB Heat Sinks

COB (Chip-on-Board) technology packages multiple LED chips directly onto a substrate, creating extremely high power densities in compact form factors. This concentrated heat generation—often exceeding 100W in areas smaller than 30x30mm—presents unique thermal management challenges requiring specialized heat sink solutions.

Unlike traditional LEDs where individual components can be spaced for cooling, COB arrays concentrate thermal loads demanding heat sinks with exceptional heat spreading capabilities, optimized base plate designs, and high-density fin arrays. Our 15 years of CNC machining expertise ensures COB heat sinks that maintain LED junction temperatures within specifications, preserving lumen output and color quality throughout extended operational lifespans.

100W+

Power Dissipation

30x30mm

Compact Footprint

0.5°C/W

Thermal Resistance

COB Heat Sink Product Portfolio

100W COB Kits

255x255x330mm copper heat sink kits designed for 100W COB LED modules with complete thermal solutions.

Passive Aluminum Solutions

100W passive aluminum heatsinks for COB CXB3590 and similar high-power chip-on-board applications.

Standard COB Profiles

Efficient cooling solutions for standard 100W COB LED configurations with optimized fin geometries.

Custom Thermal Management

Manufacturers custom COB LED heat sinks tailored to specific chip-on-board configurations and requirements.

Round COB Heatsinks

Custom circular 300W aluminum COB heatsinks for high-power LED light engine applications.

Industrial UFO Design

320mm diameter 200W large aluminum profile heat sinks for industrial COB LED high-bay lighting.

Precision CNC Manufacturing

Rapidaccu’s 15 years of thermal engineering expertise ensures COB heat sinks that meet the demanding requirements of high-power chip-on-board LED technology. Our advanced CNC machining capabilities deliver precision thermal solutions.

Heat Spreading Base Plates

CNC-machined flat base plates with superior thermal conductivity for uniform heat distribution from concentrated COB sources.

Optimized Fin Arrays

High-density fin designs maximizing surface area while maintaining structural integrity and manufacturability.

Surface Treatment Options

Black anodizing, powder coating, and custom finishes for enhanced thermal emissivity and corrosion protection.

Quality Assurance

Rigorous dimensional inspection and thermal performance validation ensuring specification compliance.

Key Design Considerations

COB heat sinks require specialized engineering addressing unique thermal challenges

Heat Concentration

Managing extreme power densities in small areas requires exceptional heat spreading from base to fins.

Thermal Interface

Flat mounting surfaces within tight tolerances ensure minimal thermal interface resistance.

Airflow Optimization

Fin spacing and geometry balanced for maximum surface area with minimal flow resistance.

Material Selection

Aluminum alloys or copper bases chosen based on thermal conductivity and cost requirements.

Primary Applications

Horticultural Lighting

High-power COB grow lights for indoor agriculture requiring maximum photon output and reliable thermal management in 24/7 operations.

High-Bay Fixtures

Industrial and warehouse lighting using COB LED technology for efficient illumination of large spaces with minimal fixture counts.

Spotlight Systems

Architectural and stage lighting spotlights leveraging COB technology for high-intensity directional illumination with compact form factors.

Street Lighting

Outdoor area and street lighting using COB LED modules requiring weather-resistant heat sinks for extended operational life.

Retail Display

Commercial retail track lighting and display illumination demanding excellent color rendering and thermal stability for merchandise lighting.

Video Production

Studio lighting panels and video production equipment using COB LEDs for flicker-free, color-accurate illumination with silent cooling.

Frequently Asked Questions

What makes COB heat sinks different from standard LED heat sinks?

COB technology concentrates multiple LED chips in extremely small areas—often 100W+ in 30x30mm footprints—creating power densities 5-10x higher than discrete LEDs. This demands heat sinks with superior heat spreading bases to distribute concentrated thermal loads across fin arrays. COB heat sinks require flatter mounting surfaces (within 0.05mm) for optimal thermal interface contact. Base plate thickness and thermal conductivity are more critical than with discrete LEDs where individual components can be spaced for cooling.

How do I select the right COB heat sink size?

COB heat sink selection depends on COB wattage, thermal resistance requirements (typically 0.5-1.5°C/W), ambient temperature, and available airflow. As a guideline, passive cooling requires approximately 60-80cm² surface area per watt in still air. Active cooling with fans reduces requirements by 3-4x. Our engineering team performs thermal modeling based on your COB specifications (model, power, thermal resistance), operating environment, and space constraints to recommend optimal heat sink dimensions ensuring junction temperatures remain below 85°C.

Should I use aluminum or copper for COB heat sinks?

Most COB applications use aluminum (6063-T5) providing excellent thermal conductivity (205 W/mK), light weight, and cost-effectiveness. For ultra-high power densities above 150W or compact designs, copper bases (385 W/mK) with aluminum fins offer optimal thermal performance. Pure copper heat sinks suit specialized applications where maximum thermal conductivity justifies higher cost and weight. The choice depends on COB power density, space constraints, and budget. Our team recommends optimal material selection based on your specific application requirements.

How important is the thermal interface for COB heat sinks?

The thermal interface is critical for COB applications due to extreme power densities. Heat sink base flatness within 0.05mm across the COB contact area is essential. Use quality thermal interface materials—typically thermal grease (0.5-1.0°C·cm²/W) or thermal pads for high-volume assembly. Poor thermal interfaces can add 0.5-1.5°C/W resistance, drastically impacting performance. Our CNC machining ensures precision flat surfaces. Proper mounting pressure (typically 3-5 kg/cm²) distributes thermal interface material uniformly, minimizing contact resistance between COB and heat sink.

Can COB heat sinks be used in outdoor applications?

Yes, with appropriate surface treatment and design considerations. Outdoor COB lighting (street lights, architectural fixtures) requires anodized aluminum (minimum 10-15 microns) for corrosion protection against moisture and UV exposure. Black anodizing is preferred for enhanced thermal emissivity. Heat sink design should prevent water accumulation through proper drainage features and avoid horizontal surfaces retaining moisture. Our outdoor-rated COB heat sinks incorporate weather-resistant finishes and geometries proven in streetlights and area lighting installations operating in diverse climates worldwide.

Do you offer custom COB heat sink designs?

Absolutely. We specialize in custom COB heat sink engineering tailored to specific chip-on-board modules and lighting product requirements. Our capabilities include thermal analysis and modeling, custom extrusion profiles, die-cast tooling for complex geometries, CNC-machined prototypes, and various fin configurations optimized for your application. Whether developing new COB luminaires or upgrading existing designs, we provide complete thermal solutions from concept through production. Submit your COB specifications, thermal targets, and space constraints for custom recommendations.

Optimize Your COB LED Performance

Partner with Rapidaccu for precision-engineered COB heat sinks that maximize chip-on-board LED lifespan, maintain lumen output, and ensure your lighting products deliver exceptional performance throughout their operational life.

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Contact Rapidaccu

Address

Rongli Industrial Park, Dalang, Longhua District, Shenzhen, China

Email

info@rapidaccu.com

Experience

15 Years of CNC Manufacturing Excellence

Rapidaccu Advantages

Precision CNC machining technology
15 years COB thermal expertise
Custom design capabilities
Comprehensive quality control
Worldwide shipping expertise