How to calculate the service life of LED panel lights
Jun 01, 2021
How to calculate the service life of LED panel lights
The original grille lamp replaces the ceiling, and the LED panel light has many advantages. The most important one is that its use time is particularly long, and the LED panel light can be used in a wide range. For example: ceiling, wall, installation body and other lighting
1. The light decay of LED:
2. Temperature coefficient of LED volt-ampere characteristics
3. How to measure the junction temperature in detail.
Take an LED panel light as an example to illustrate how to specifically measure the junction temperature of the LED. The demand has now installed the LED in the heat sink, and the constant current driver is used as the power supply.
The two wires connected to the LED should be led out together. Connect the voltmeter to the output terminal (positive and negative of the LED) before powering on, and then turn on the power supply. Before the LED has heated up, immediately read the reading of the voltmeter, which is also equal to the value of V1, and then wait At least one hour, when it has reached thermal equilibrium, measure it again, the voltage at both ends of the LED is equal to V2.
Subtract these two values to get the difference. After being removed by 4mV, the junction temperature can be obtained. The junction temperature obtained by using this method is definitely much more accurate than using a thermocouple to measure the temperature of the radiator and then calculating its junction temperature.
4. How to extend the life of panel lights
The key to extending its life is to lower its junction temperature. The key to lowering the junction temperature is to have a good heat sink. The heat generated by the LED can be emitted in time. In fact, this is a question of junction temperature measurement. If we can measure the junction temperature that any kind of radiator can reach, then not only can we compare the heat dissipation effects of various radiators, but we can also know that after choosing this radiator The lifetime of the LED that can be completed.
