1. (Positioning) When we develop a street light, we must first have a positioning (developing the lighting condition table, such as the general structure of the lamp, power, electrical performance index, luminous efficiency, protective performance, expected weight, etc.), At present, many people don't know enough about LED and LED lighting systems, knowing why they don't know why.
At present, the domestic LED road lighting standards are still officially introduced, and the local standards drafted by Dongguan QS Company have not entered the formal implementation stage. Therefore, this article still starts with CJ45-2006, hoping to play a role in promoting everyone and making progress together.
In the standard, there are clear requirements for the illuminance value and uniformity of the roads of various roads. Take the main road as an example, and the average illuminance is required to be 20-30 LUX. According to your pole height and spacing, you can get roughly one luminous flux. The data. What needs to be trapped by snow is that this is the luminous flux of the luminaire, and the luminous flux of the light source depends on your structure. That is the efficiency of the luminaire.
2, (heat treatment) According to the optical pass, we can find the number of our LEDs and the approximate power of the heat source, and then we can design the heat dissipation system. At present, it is strictly forbidden to use passive heat dissipation (such as adding air). Therefore, it can only rely on its own heat dissipation structure. (Direction: greater heat dissipation surface area, higher dispersion conductivity, heat sink utilization efficiency, insulation solution) The design of the heat dissipation system, we design a temperature rise limit, such as 25 degrees ambient temperature, no more than 25 degrees And then calculate the system thermal resistance. In the material of the radiator, the condition can be selected well. Generally speaking, the heat conduction of 6063 is 205W/M. K, 6061T5 is 180W/M. K, die casting general ADC12 is 40-60W / M. K, the legendary die-casting 1017 can also be more than two hundred, but it has not been used, and no external manufacturers have confirmed it. Good conductivity is very obvious in improving heat dissipation. For the design of the heat sink, a finned heat dissipation structure is generally used to obtain the maximum surface area. It should be noted that the direction of the heat sink is generally selected to be parallel to the road axis. (Some claims that the heat sink is parallel to the road axis, the wind on the road is conducive to heat dissipation, in fact, it is unscientific, the problem of fluid influence can also be known by the actual measurement), the fin design of the radiator is better. The good way should be a small and large structure, and the lower part of the fin thickness is preferably 5mm (depending on the thermal power), and the depth is preferably not more than three to four times the maximum of the fin. The reason is simple and dense. The more severe the heat return, the worse the heat dissipation effect. The thickness of the bottom of the heat sink can be designed to be thinner, such as no more than 3mm, to reduce the weight of the product. A good luminaire design will place the LED section above the fins for this purpose. In the steel glass structure and other practical applications, in order to waterproof, the product often has a closed insulation layer, resulting in a continuous increase in temperature, the hot air is upward, and can be solved according to the specific solution.
The heat generated by the LED is always transmitted faster. Therefore, under the aluminum substrate, we usually add nanotubes or other things to better achieve the soaking and heat conduction effects. The more cost-effective way is to add graphite. For the film, you can ask the supplier for relevant information. In addition, the fins of the radiator are always the lowest utilization rate. In order to improve this problem, some companies have introduced heat pipe cooling. In fact, heat conduction and heat dissipation are two different concepts. Here I am talking about heat pipes, which can be fast. It conducts heat and increases the utilization of some heat radiating fins. Therefore, in the evaluation of cost performance, we can consider and choose according to the actual plan. . It is also possible to combine experimental data by means of software simulation.
3, optical considerations (larger light utilization, light distribution, etc.) optical design, can be achieved by means of related software, such as TRACEPRO, different brands of light-type LEDs, and with different folding lenses, LED spacing, aluminum The thickness of the substrate is quite required, and the optical effect portion can be used to achieve a more reasonable light distribution by means of a soft body. Here we only talk about light efficiency. The design of the luminaire is best to keep the light from the LED closest to the wall of the lamp body from being blocked. The inner wall of the luminaire can be angled at certain conditions. Of course, it can also be treated like chrome plating to get better. Light output. It is more common to add a reflective sheet. The angle of the reflective sheet can be calculated by software. The reflective sheet can increase the utilization of stray light, which can increase by about 15%. Some people say that the LED beam angle is 120 degrees, etc. In fact, we must know that 120 is defined as the maximum light intensity. In addition, when the light encounters an object such as glass, part of it will be transmitted, and some will be reflected back. You can refer to the optical basis.
4, structure, generally speaking, I recommend the tempered glass solution, because the performance is more stable than the PC lens exposure scheme. PC materials will have a lot of weather resistance, and with the stress, waterproof is difficult to solve. In order to suit different installation conditions, it is more suitable for folding, the installation is convenient, the angle is adjustable, and the appearance of the radiator is better.
5, electrical, the most suitable solution for the general 1W LED is still 350mA drive. (Hot, electricity, stability, there are many LEDs for the thin film chip, the higher the current, the worse the reliability) The better way is to open the constant current part separately, each channel has a constant current, it is worth mentioning that Today's LEDs are packaged in Zener, so there is no need to add a Zener.
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