Advantages and disadvantages of internal and external LED tube power supply
Since the power supply is built-in, the heat of the power supply is added to the tube. Assuming that the efficiency of the power supply is 88%, 2.4W of heat has to be dissipated, which is equivalent to an increase of 30% of the heat, which means a total of 10.4W The power cannot be dissipated. This makes the heat dissipation of the LED more difficult, or in other words, the service life of the LED is shortened. Moreover, the length of the power supply is about one-fifth of the length of the lamp tube, and the heat generated by the power supply is also concentrated in this section, so that the LEDs close to the power supply are subjected to hotter baking, so the lifespan is longer than the LEDs in other places. Short, when the lamp is damaged, the section close to the power supply is blacked out first. It can be considered that the life of LED fluorescent lamps with built-in power supply will not be higher than 10,000 hours. And put the power supply into the tube, the power supply itself has to withstand the high ambient temperature generated by the LED, which greatly reduces the life of the electrolytic capacitors in the power supply, and also reduces the life of the entire lamp. Because the LED fluorescent lamp with built-in power supply has a lifespan of only 10,000 hours, compared with 50,000 hours of external power supply, its use cost is obviously 5 times higher. Not only that, in the process of use, whether the LED is damaged or the power supply is damaged, the two are usually discarded together. And the LED fluorescent lamp of the external power supply, you can throw which one is broken. In addition, the built-in power supply also increases the cost of recycling and processing electronic waste. Because the power supply part must be disassembled and dealt with separately. The external power supply not only has high efficiency and long life, but also can add special functions such as manual dimming or automatic dimming, which are unmatched by the built-in type! From the above introduction, we can conclude that the shortcomings and problems of the built-in type are very serious. Unfortunately, some people just covet that it may be 10% cheaper at the time of purchase, regardless of its use cost more than 5 times higher. It can be said that a small loss is a big loss, and the gain outweighs the loss!
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