What heat transfer techniques are used to cool LEDs?

LEDs are cooled either by passive cooling or active cooling.

Passive cooling involves a finned heat exchange system made of cast or extruded metal or a plastic coated metal heat sink that offers a totally silent, robust, heat transfer.

Passive cooling is reliant on the surface area of the heat sink material and is orientation dependent.

Active cooling may include conventional fans or diaphragm- based forced air cooling.

Active cooling using a fan, although more efficient, is noisy, not so reliable, and requires electricity to run.

Active cooling places emphasis on forced air flow rate and is not orientation dependent.

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