What is the relationship between the junction temperature and the lifetime of the LEDs?


What is the relationship between the junction temperature and the lifetime of the LEDs?

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"The junction temperature of 105 degrees, the flux has decreased rapidly to 70%, and then the life of the LED Light is about 10 thousand hours, if the temperature control at 55 degrees, LED life can go up to 'to 100 thousand + hours.'

So we need to find a way to calm ourselves down and let them LEDs dissipate the heat you have.

So, how do you get rid of the heat?


Principle of heat dissipation LED: Heat dissipation to modes 3: conduction, convection, and radiation.
Conduction: the path of heat from the upper part of the object along the body to the lower part of the temperature;

Factors Affecting Heat Transfer:


1. Heat sink material
2. Heat dissipation structure;

The closer the material is, the faster the heat transfer and if the two materials touch a little bit, the thermal conduction is blocked, and it is the thermal resistance. At this point, we can heat the material between materials so that the heat passes well.

. Shape and size of the thermally conductive material.
. Radiation: the phenomenon that high-temperature objects radiate directly to the outside:

The effectiveness of thermal radiation depends on the thermal resistance of the surrounding environment (surrounding environments are often called air) and the characteristics of the thermal radiation itself. But the radiation heat transfer is not so important for the LED Canopy Light, the Light itself because the temperature is not high when the temperature is not too high, the radiation phenomenon is not very strong.


Now, there are two radiators, almost the same shape, but one is sealed, one has opened the slot, it is obvious that the cooling capacity of the radiator on the right side is much better, in addition to the heat dissipation by conduction and convection, conduction to dissipate heat.

Understand the relationship between heat dissipation and the light efficiency of the Light, life, and heat dissipation mode, how can we judge whether a Light is good or bad?

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