November 16, 2019

LED patch module, how to distinguish the quality of exposed lights

One: raw material structure and its performance

1. Chip manufacturer. The top chips are mainly from the United States, Germany, Japan and South Korea. Most of the chips used by mainland module manufacturers are produced in Taiwan. This is related to the manufacturer's positioning, market conditions and policies. Different chip manufacturers generally have different stability properties. Core, Osram, Nichia and other world-class chip manufacturers have fixed target markets, such as defense orders. If you import a little CREE chip to make a module, it is not worthwhile to use.

2. The size of the chip. The same kind of chip, the larger the size, the higher the brightness, the stronger the bearing capacity, the better the stability, and of course the higher the price. The chip sizes are now mainly 9MIL, 10MIL, 12MIL, 14MIL and 23MIL.

3. Luminous efficiency. The LM value emitted per watt is called luminous efficiency. This is an important criterion for judging whether LEDs are energy efficient. The incandescent lamp is about 14.4LM/W, the fluorescent lamp is about 51LM/W, the neon is about 43LM/W, and the LED is currently up to 150LM/W. However, most of the LEDs used in China have a luminous efficiency of 60~100LM/W. It should be noted that only white light in the LED can achieve such high light efficiency, and red, yellow and blue are generally relatively low (this is mainly related to human visual definition). However, compared with neon lights, there is no heavy metal pollution and easy maintenance.

4. Life expectancy. The life of the LED is considered to be 100,000H. In fact, LED products can reach 100,000 hours after 10 or 20 years, and the best LEDs are currently expected to last only 50,000 hours. Incandescent lights are 1000 hours, fluorescent lights are 2000 hours, and neon lights are 10,000 hours. The so-called 100,000 hours is only measured by scientists at room temperature in the laboratory. Moreover, after the chip is packaged into a finished LED product, even if it is a top-level chip, due to the advanced differences in the equipment used by the packager, the technical differences, the different packaging forms, the different management, and the difference in the way users use, Lead to different life spans. SMD LEDs can last up to 40,000-50,000 hours; piranha LEDs can last up to 30,000 hours, and in-line LEDs have a lifetime of 10,000 hours. Of course, as the chip and packaging technology advances, the data will gradually increase. The premise is that everyone understands an important concept, LED life is when the LED brightness is 70% of the original brightness, we determine that the LED life is so far.

5. The quality of the board. With the same quality LEDs, the quality of the board can have a significant impact on the life of the LED. The circuit board is divided into aluminum plate, glass fiber board, semi-glass fiber board and cardboard. The quality of the aluminum plate is the best, and the heat dissipation effect is the best, but the cost is too high. Domestic manufacturers generally only use it on high-power LED products. Manufacturers of module exposed lamps generally use cardboard, semi-glass and fiberglass. In terms of modules, monochrome piranhas and straw hat modules are generally made of cardboard or semi-glass, and the patch series generally uses semi-glass or fiberglass. The colorful and full-color series must be at least half-glass.

6. Supplement: Comparison of IC and components in the full color series. There are dozens of ICs, different ICs, different performance, stability and price, which leads to different cost of finished products.

7. How is the solder brightness, whether it is full, and whether there is no solder joint. This affects heat dissipation and signboard stability.

8. Wire. Silicone case, containing more copper wire, the body is soft, this is the best wire. The silicone sleeve resists oxidation for a long time, and also makes the wire body soft, which is convenient for the user to install in a small space. The copper wire can pass more current and is not burned by a large current. If the wire is UL listed, the quality is definitely reliable.

9. Housing. A good outer casing can be UV-resistant and flame retardant.

10. Resistance quality.

11. Glue quality.

Two: simple and effective way to distinguish and identify

Obviously, only the appearance can not determine the quality of the product. The product structure of the large and small factory is circuit board, lamp bead, wire, glue, outer groove and so on. So still need some simple operations to identify:

Lighting module:

1. Compare the brightness, put the acrylic plate close to the same number of modules and slowly increase the small distance, here to see if the brightness of the lamp can meet your own requirements. Put the module directly in the word to see the effect is better recognized.

2. Compare the current through (this is very important). White light theory is generally <=20MA, other <=25MA, due to the difference in chip raw materials used by the chip module and the chip size is slightly larger, the bearing capacity is larger, in actual applications, in order to meet higher brightness, there may be 2 The increase of -5MA, of course, is based on the fact that the results of the chip factory test do not affect normal use. For modules with very high currents, such as 30-40MA, I think users should consider their stability. Many users are judged by observing the resistance model. In fact, this is unscientific. The size of the resistor cannot determine the overall current of the module. Because the size of the lamp bead is different from the raw material, the resistance of the lamp is different, so it is still overall. The current is referred to comparative science. In fact, some signs can start at the beginning of brightness. After a period of time, the length is one year. In a short 3-5 months, it becomes dark and dark, especially white light. The reason is that the light decay is too big, and the root cause is The current is too large.
The reason why the above is done is because most users have no conditions to determine the production, structure, size and life of the chip. It is difficult to guarantee the facts only by the explanation of the factory. While watching the brightness, pay attention to whether the light of the lamp beads is uniform. When observing white light, be sure to pay attention to whether there is any chromatic aberration (this is very important) - if you cover it with a thin piece of white paper, you may not be able to observe it, so use a certain thickness of acrylic. Whether or not there is color difference is the most important part to distinguish the quality of white light modules, and it is also one of the most important reasons for price differences. The spectroscopic equipment is expensive or even scarce in the mainland market, which has led to the emergence of many white LED modules with exposed color and exposed lights. In a white light signboard, some places appear cool white, some are white, some are warm white, and even appear red, purple, blue, etc., looks like a big flower face. This is caused by chromatic aberration or severe light decay; a group of white light modules are installed to find inconsistent colors, or the previous batch is inconsistent with the next batch, which is because there is no reason for splitting or not being divided.

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