What Should Be Paid Attention To in The Design Of LED Underground Lights

First, the design (choice) of the housing, the material of the housing, 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 housing? Those who understand crystalline phases should know that there is a nucleus size in the crystallization process of night aluminum, because the nucleus size of different casting methods will be different, 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 shell is buried in water and soil for a long time under the action of cold and heat suction, water will slowly penetrate into the lamp shell. We are often blinded by the gorgeous exterior of the shell, which is aluminum at first glance. 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 it is not recommended to choose 2.5 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. Adopt V-shaped rubber ring in the V-shaped hole through the nut to compress it to prevent water from infiltrating from the side of the rubber ring and prevent water from infiltrating from around the wire 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.

Third, the rubber pad between the upper cover and the lamp body is waterproof in the way mentioned above, the lower part of the lamp body is waterproof. Here, the upper part of the lamp body is waterproof. Some people use a stainless steel shell to make the lamp body and found that water is still entering the lamp. It causes water or moisture to be inhaled, and a layer of water droplets form on the glass surface 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. The thickness of the upper part is 1~1.5mm and the thickness of the lower part is 2~2.5mm. The width of the upper and lower pressing is recommended to be 6~10mm. Pay special attention The hardness of the rubber ring should not be too hard. The hardness should be 35. If it is too hard, it will not stick tightly, causing 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 the responsibility. What can I do if the glass is broken? 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 inside the lamp was too high and it was suddenly 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 tempered, stress-relieved, and the strength must be able to withstand the impact of 2EJ, and the thickness should be 5~10mm as a reference.

Fifth, heat dissipation; the heat dissipation of LED underground lights should be considered? What you said is 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. For the earth, anyone who understands will understand that it is possible that the housing is 40 degrees, and the LED wick temperature inside is above 80 degrees, so that the LED will be heat-dead in an icy environment, and the lamp will not be bright for long, so the design or selection of the housing At this time, the direct or indirect contact area between the lamp housing and the LED should exceed 80%.