How to extend the life of LED: The key to extending its life is to reduce its knot temperature. The key to reducing the temperature is to have a good radiator, which can timely distribute the heat generated by LEDs in time. If we can measure the knot temperature that any kind of radiator can achieve, then not only can we compare the heat dissipation effect of various heat sinks, but we can also know the LED life that can be achieved after using this radiator.

How to measure the knot temperature: The knot temperature looks like a temperature measurement problem, but the knot temperature to be measured is inside the LED. It is always possible to use a thermometer or thermocouple to put it into the PN knot to measure its temperature. Of course, its shell temperature can still be measured with thermocouple, and then it can calculate its knot temperature based on the thermal resistance RJC (associated to the shell) given. But after installing the radiator, the problem becomes complicated.

Because LED is usually welded to the aluminum -based plate, and the aluminum substrate is installed on the radiator. If you can only measure the temperature of the radiator housing, you must know the value of a lot of thermal resistance. Including RJC (condensed to the shell), RCM (shell to aluminum -based plates, in fact, it should also include the thermal resistance of the film printing version), RMS (aluminum substrate to the radiator), and RSA (radiator to air), as long as there is only one of them Inaccurate data will affect the accuracy of the test.

The temperature coefficient of LED Voltic characteristics: We know that LED is a semiconductor diode. It has a Vodiatity like all diode, and it is the same as all semiconductor diode. This volttite has a temperature characteristics. Its characteristics are that when the temperature rises, the ambush characteristics move left.