About dive lights’ heat dissipation

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XTAR

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For LED dive lights, the energy consumed by LED is a large part of heat energy except for conversion into light energy. While, the heat would be the great enemy of LED performance. With temperature rising, LED dive lights’ useful life is shortened, also affecting brightness and color quality. Therefore, the lights’ heat dissipation is very important.

Generally, heat is generated from the LED chip and is transferred through heat radiation, heat conduction, and heat convection. LED itself doesn’t have infrared and ultraviolet rays, so it has no radiation and heat dissipation function, mainly through conduction and convection. So the heat dissipation design is a key technology for the successful application of LEDs.

Usually a heat sink is built on the light, which is the main medium for heat dissipation. After the heat sink absorbs the heat, the heat is dissipated by convection. Besides, there are also some other factors affecting LED’s heat dissipation. For example, how the light diodes are mounted, whether they are encapsulated in a housing, and even the types of adhesive used in constructing a fixture.

Due to the high output of the dive lights, the heat generated by the LEDs must get dissipated into the medium the light is being used in. Water is more efficient when it comes to heat transfer, thus dive lights are designed to dissipate the heat below the surface. Some dive lights even have the smart temperature control, such as xtar D20 1000 dive light, when temperature within rises to 55°C or higher, this dive light itself will reduce brightness to ensure its normal function, which prevents it from overheating and damaging itself.

xtar D20.png
 
https://www.shearwater.com/products/swift/

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