On The Advantages And Disadvantages Of The Design Materials For Thermal Conductivity And Heat Dissipation Of LED Lamps
- Jul 31, 2018 -

Thermal conductivity:

Wire substrates, caulking materials, shell materials  (LED High Bay Light)

Cooling part:

Shell design, surface design, surface materials

Next, we have sorted out the advantages and disadvantages of these materials. You are welcome to join us. (LED High Bay Light)

Part of thermal conductivity

Line board

Glass fiber board


It's cheap and easy to make

Insulation characteristics are not considered


LED design with electrode on heat sink is not applicable

The hole should be filled with tin to increase the process

The copper foil layer should be thickened to increase the heat conduction efficiency (LED High Bay Light)

Aluminum plate


General acceptance is high (LED High Bay Light)

The hardness is higher than FR4, and the thermal conductivity of heat dissipation shell is better

Electrical insulation is higher than glass fiber board (LED High Bay Light)


The price is higher than FR4 (LED High Bay Light)

Other electronic components cannot be placed on the substrate (LED High Bay Light)

The thermal conductivity of insulation layer is not easy to master (LED High Bay Light)

Copper substrate


Thermal conductivity is much higher than aluminum substrate (LED High Bay Light)

Lower than the heat value, easy to pull up the conduction temperature (LED High Bay Light)

It has the same advantages as aluminum substrate (LED High Bay Light)


High cost, general design is not applicable (LED High Bay Light)

Have the same defects as aluminum substrate (LED High Bay Light)

A total of gold plate


There is no blocking in the conduction center, and the thermal conductivity is good (LED High Bay Light)

It can be applied to the substrate application of high power polycrystalline LED


LED applications that are not suitable for radiator with electrode are too expensive

Not applicable to 1~5W power applications (LED High Bay Light)

High opening cost

Composite sheet


The thermal conductivity is the highest, up to 500W/mK

High thermal repulsion, leaving no heat energy in the body


Manufacturing is not easy, processing is difficult (LED High Bay Light)

Poor material stability, long - term use of doubt (LED High Bay Light)

The cost is too high to be commercialized in mass production (LED High Bay Light)

Caulking materials

Thermal conductive paste


Low cost, easy to use

No specific process


Not uniform coating, easy to form bubbles (LED High Bay Light)

The product is unstable for a long time, easy to solidify and solidify

 (LED High Bay Light)

And then you have a thermal barrier (LED High Bay Light)

It is easy to pollute other parts and increase the cost (LED High Bay Light)

The silicone pad


Long time temperature resistance performance is good, can withstand temperature

125 ~ 200 ° C

The higher the temperature, the better the thermal conductivity

It is elastic and not easy to form bubbles


High cost, increase product cost

The thickness is high, generally over 0.3mm

Hot phase change silicone pad

Hot phase change silicone pad


It has the advantages of general silicone pad products (LED High Bay Light)

The silicone will soften at high temperature to increase the sealing effect and 

Increase thermal conductivity


It is not easy to be processed after processing and cannot be used again

High cost, increase product cost

The shell material

Aluminum - extruded (pull up)


High thermal conductivity, high heat transfer speed

The mould cost is low and the length can be cut at will

Easy to make


Less hardness/rigidity

The appearance is relatively unchanged, and the aesthetic design is not easy

Fin heat dissipation, easy to cause dust accumulation

Aluminum - die casting


The appearance can change at will, beautify the appearance

Can be mass rapid production


Mold design and development costs are high

Long development time, not easy to modify the design

Thermal conductive plastic


High insulation performance

Light weight

Easy to mass produce


Need to develop molding mould, high cost, long time

Poor thermal conductivity, high thermal resistance and poor LED life

Plastic-aluminium composite


It can reduce the thermal resistance of the system, increase the life of LED light source, and not reduce the insulation


The production process is complex, increasing the production cost

Increase product weight

The cooling part

The shell design

Fin design can increase the effective heat dissipation area;

Note the ratio of fin height to fin spacing;

Note the ratio of fin height to fin thickness;

Note that the width of the base and end of the fin should be different.

The surface design

The surface can be roughened to increase the surface area.

The lateral fin of the column can be increased to increase the effective surface area.

Surface material

Anodic oxidation treatment can be selected, and the applicable temperature should be noted.

High heat exchange efficiency materials can be selected for spraying;

Avoid mirror baking.