Every time you deal with the seller of the lighting company, you will repeatedly mention a vocabulary: warranty. Each manufacturer claims that the warranty time is different. There are two years of warranty, three years of warranty and five years of warranty.
However, in many cases, the seller does not understand, how does this warranty time come from, or is it just that the LED should be warranted for such a long time?
Today, Xiaobian takes you into the world of LEDs to find out how the life of the lamps is defined and judged.
First of all, when it comes to LEDs, we can tell at a glance that it is different from traditional light sources because almost all LEDs have a remarkable feature - the heat sink.
A wide range of heat sinks are not intended for the aesthetics of LED luminaires, but for LEDs to work better.
Then you must be wondering why the previous light source used less radiators, and almost all the lamps in the LED era used radiators?
That is because the previous light sources are all illuminated by thermal radiation. For example, tungsten lamps are based on heat, so they are not afraid of heat. The basic structure of the LED is a semiconductor P-N junction. The temperature is slightly higher and the performance is degraded. Therefore, heat dissipation is very important for the LED.
First, let's take a look at the composition and schematic of the LED.
Tip: The LED chip will generate heat when it works. We refer to the temperature of its internal PN junction as the junction temperature (Tj).
In our daily life, the luminous flux of LEDs will decrease with the increase of junction temperature. As shown in the figure, when the junction temperature is 25 °C, the luminous flux is only 80% when the junction temperature reaches 100 °C. Left and right.
And, most importantly, the lifetime of LED luminaires is closely related to junction temperature.
One concept that needs to be understood is that when we routinely talk about the life of an LED, it is not that it burns out at the end of life. Generally, when the LED light output reaches 70%, we think it is the end of life.
As can be seen from the above figure, if the junction temperature is controlled at 105 °C, the luminous flux will be attenuated to 70% for about 10,000 hours, and if the junction temperature is controlled at about 60 °C, then it will reach 100000+ hours. Will decay to 70%. Life expectancy has increased by a factor of 10.
In daily life, the most common thing we encounter is that the LED has a life of 50,000 hours, which is actually a data when the junction temperature is controlled at 85 °C.
Since junction temperature plays such an important role in the life of LED lamps, how can we reduce the junction temperature? Don't worry, let's first look at how the heat is dissipated. Knowing how to dissipate heat, you naturally know how to lower the junction temperature.
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