What are the reasons for the failure of outdoor LED lamps?

Update:16-02-2022
Summary:

Outdoor LED lamps often encounter situations where the […]

Outdoor LED lamps often encounter situations where the lamps are out of control or the lamps fail, especially after heavy rain. Why does this happen? The main reason is waterproofing. Waterproofing is a key issue for outdoor lighting products. It determines whether outdoor lighting products can be used stably for a long time outdoors.

Most of the light sources used in traditional lamps are powered by AC, but the interior of LED products are powered by DC, and the DC power supply will cause electrochemical corrosion when encountering water or water vapor.

Galvanic Corrosion
The conductive part and the welding part inside the lamp are mainly copper and tin. The tin mainly plays the role of welding. If water enters the lamp, the galvanic cell will corrode if there is no space. After the water enters the lamp, the long-term corrosion inside the lamp causes the tin to be slowly corroded, and there is a "virtual welding" situation. This is why there is a problem when it rains. It is difficult to guarantee the integrity of the entire project as it arises.
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Electrolytic cell corrosion
Outdoor lighting products must consider the corrosion of the lamp shell. If sodium chloride is attached to the surface of the lamp shell, the primary battery will be seriously corroded. Therefore, the seaside area needs to consider the anti-rust and anti-corrosion treatment of the lamp surface. When the inside of the lamp is energized, the electrolytic cell will corrode, and the positive and negative electrodes will have a very strong reaction, causing the tin to be dissolved rapidly, and then the copper will also be dissolved. corroded.

Today's lighting products are becoming more and more miniaturized and modular, and the internal circuit is relatively complex. If the above situation occurs, it will have a great impact on the transmission of the signal. From this point of view, to ensure that the product is used outdoors for a long time, waterproofing is crucial. important. Ultraviolet rays, high and low temperatures, thermal expansion and contraction of air are all factors that affect the waterproof performance of lamps.