What should be paid attention to in the design of LED underground lights

LED buried lights should be very extensive in daily lighting projects, but you don't know what matters should be paid attention to in the design of LED buried lights. The design of LED underground lights is different from LED wall washer and LED energy-saving lamps. In addition to solving the problem of lighting efficiency, LED underground lights must also pay attention to waterproof performance.

The initial application range of LED underground lights is very wide. The landscape lighting in the prototype seems to start from the control changes of LED underground lights. But now, almost no one wants to make LED underground lights again. The reason is very simple- --The LED buried lights I saw basically don’t emit light. After the LED buried lights were introduced, people thought that the situation would be improved, but the situation was counterproductive. Because of the special power supply reasons, the LED buried lights were better than LED buried lights of other light sources died earlier, and many people are puzzled. In fact, when designing and manufacturing LED buried lights, there are many potential techniques that failed to attract people’s attention. Many people think that LED buried lights are IP65. That's enough, only underwater lights use IP68, the result? The big problem of our door is waterproofing, because we always think that the lamp is buried in the soil. In fact, the lamp of our door is stuffed in the "well". In some cases, the environment of the LED underground lamp is better than that of the underwater lamp. Bad, because the underwater light deals with the problem of water pressure penetration, the LED underground light has to solve the problem that the geothermal temperature is changing between hot and cold 24 hours a day. Of course, damage to glass by external forces is also a factor that cannot be ignored. The following is a summary of some techniques for designing and manufacturing LED underground lights.　　 One, the design of the shell (choice), the material of the shell, many people will choose aluminum, this is not a wrong choice, after all, the cost pressure of stainless steel is too great, but why is there still water in the aluminum shell? Those who understand crystalline phases should know that there is a nucleus size in the crystallization process of night aluminum, because the size of the nucleus will be different for different casting methods, which will cause the problem of poor and dense shell texture, because casting The size of the sand-infused shrinkage cavity formed by different methods of aluminum blanks will also be different. When the outer shell is sparse to a certain extent, the sand-inlaid shrinkage cavity is as small as a certain amount. A short time of flushing and soaking in water will not cause water molecules. Immersion, but when the lamp housing is buried in water and soil for a long time under the action of cold and heat suction, the water will slowly penetrate into the lamp housing. We are often blinded by the gorgeous exterior of the processed housing, which is aluminum. Yes, take it back and soak it in water for half an hour. When it’s dry inside, it’s OK. We think that there is no problem with waterproofing, but as soon as it is made, water will enter the same. Therefore, it is not recommended to choose sand cast aluminum shell, and 2.5 is not recommended. When designing the lamp body with a die-cast aluminum shell with a thickness of less than mm, the design thickness is recommended to exceed 2.5mm, and die-casting with a die-casting machine with enough space.

Second, the design of the cable hole, many people use a traditional PG7 to solve the waterproof problem of the LED buried light. This is also a misunderstanding. The traditional PG7 relies on the compression between a ring rubber ring and the shell to waterproof, because The contact surface between the rubber ring and the lamp body is limited. If it is used outdoors to prevent rain, there is no problem. If it is used in LED underground lights, it is indeed open for discussion. Here are three alternative suggestions:

1. The V-shaped rubber ring is used in the V-shaped hole to be compressed by a nut to prevent water from infiltrating from the side of the rubber ring and to prevent water from infiltrating from around the line skin (the method of underwater lamp entry protection)

2. The rubber ring uses a large and thick flat circular gasket

3. Fill the inlet with epoxy resin.

3. The rubber pad between the upper cover and the lamp body. The way mentioned above is that the lower part of the lamp body is waterproof. Here, it is said that the upper part of the lamp body is waterproof. Some people use a stainless steel shell to make the lamp body. It is found that water is still entering the lamp, which is caused by not properly handled here. Water or moisture is inhaled, and a layer of water drops on the surface of the glass when it is cold. The rubber ring here is best designed as a U-shaped sleeve on the glass, and it is waterproof on three sides after pressing. It is recommended that the upper thickness is 1~1.5mm and the lower thickness is 2~2.5mm. The upper and lower compression width is recommended to be 6~10mm, pay special attention The hardness of the rubber ring can not be selected too hard, the hardness should be 35, too hard but not tightly attached, resulting in water ingress.

　Fourth, glass. Many people ignore this problem and think that the glass has a certain thickness. As a result, if the glass is broken, I will shirk responsibility. What can I do if someone else knocks it out? Yes, some of the glass is indeed broken by people with hard objects, but this is not the whole reason, because some of the glass is broken by yourself. If your glass is not processed well or has not been processed at all, the following types Circumstances can cause the glass to break on its own:

1. The upper cover is directly pressed on the glass,

2. The wheel was squeezed but it was not broken at the time. 3 The temperature in the lamp was too high and suddenly it was hit by water 4 hard objects.

The first three types are broken due to stress, and the latter is broken due to external forces. Therefore, the glass here must be toughened, stress-relieved, and the strength must be able to withstand the impact of 2EJ, and the thickness should be 5~10mm as a reference.

5, heat dissipation; LED buried lights should consider heat dissipation? You are right and wrong. If your light source is LED, and your entire light source board is directly overhead: if your power is large enough, in this case, the heat is transferred to the shell through the air, and then the shell is transferred. To the earth, anyone who knows will understand that it is possible that the housing is 40 degrees, and the temperature of the LED wick inside is above 80 degrees, so that the LED will be heated to death in an icy environment, and the lamp will not be bright for long, so design or use the housing At this time, the direct or indirect contact area between the lamp housing and the LED should exceed 80%.