Thermal resistance of conformal coating on LED PCB?

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treez

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Hello,
Does any reader know the thermal resistance of typical conformal coating materials?

-the following doesn't give figures.
**broken link removed**

Supposing I have a LED PCB with ten LEDs on it , each dissipating 150mW, and I am using the PCB copper area around the LEDs to cool the LEDs ( no additional aluminium heatsink).
Would you expect a thin conformal coating to seriously effect the junction to ambient thermal resistance of the LEDs?

The conformal coating will only be thin, because the PCB will always operate indoors, and its just condensation and atmospheric moisture in the air that we are protecting against.
 

I do not think anybody was interested in knowing the thermal resistance of the conformal coating. Good designers use good heat sinks and do not rely on such barely defined PCB as a heat sink. Covering a metal surface with such thick varnish blocks its cooling as there is no contact with air.
Be a good designer and use good heat sinks. Or take a careful measurement and think that in the production someone adds one layer of the conformal coat and your expectation will go to hell.
 
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**broken link removed**

...this is a 14W LED PCB, and its datasheet says that it requires no heatsink. So I think it is possible...

Heres another one (LED PCB) which is single sided and obviously uses no heatsink..its power is up to 30W...
**broken link removed**
 

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