It is often said that the short life of LED lamps is mainly due to the short life of the power supply, and the short life of the power supply is due to the short life of the electrolytic capacitor. These arguments also have some truth. Because the market is flooded with a large number of short-lived and inferior electrolytic capacitors, and now they are fighting for the price, some manufacturers have adopted these inferior short-life electrolytic capacitors regardless of the quality. The result is the above conclusion.
So what is the actual situation?
1. The life of an electrolytic capacitor depends on the ambient temperature at which it operates.
How is the life of an electrolytic capacitor defined? Of course it is defined in hours. However, if the life index of an electrolytic capacitor is 1,000 hours, it does not mean that the electrolytic capacitor will be broken after a thousand hours. No, it just means that the capacity of this electrolytic capacitor is reduced by half after 1000 hours. Originally, the capacity was reduced by half. It is 20uF, and now it is only 10uF.
In addition, there is another characteristic of the life index of the electrolytic capacitor, which is to indicate the life in the case of how many degrees of working temperature. And usually it is specified as the life at 105 ° C ambient temperature.
This is because the electrolytic capacitors we use today are electrolytic capacitors using liquid electrolyte. If the electrolyte is dry, the capacitance is of course gone. The higher the temperature, the easier the electrolyte will evaporate. Therefore, the life indicator of the electrolytic capacitor must indicate the life at what ambient temperature.
So all current electrolytic capacitors are marked with a lifetime at 105 °C. For example, the most common electrolytic capacitor has a life of only 1,000 hours at 105 °C. But if you think that all electrolytic capacitors have a life of only 1,000 hours. That's a big mistake.
Simply put, if the ambient temperature is higher than 105 ° C, its life will be less than 1,000 hours, if the ambient temperature is lower than 105 ° C, then its life is higher than 1,000 hours. So is there a rough quantitative relationship between life and temperature? some!
One of the simplest and easy to calculate relationships is that for every 10 degrees increase in ambient temperature, life is reduced by half; in turn, for every 10 degrees decrease in ambient temperature, life expectancy is doubled. Of course this is just a simple estimate, but it is also quite accurate.
Because the electrolytic capacitor used for the LED driving power supply is definitely placed inside the LED lamp housing, we only need to know the internal temperature of the LED lamp to know the working life of the electrolytic capacitor.
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