Now LED purchase inquiry generally asks what chip the light source uses. If you are familiar with some, you will also ask the chip size of the light source, and then according to the same chip and the factory promised warranty time, etc. Comparing prices, but the same chip with different packages, the quality of the finished product packaged by this chip will be very different.
Let's talk about the specific differences:
1, the difference between the chip radiation power level:
Take the chip of Xiamen Sanan as an example, S-23BBMUP-C*******, the chip size is 23X10mil, this core has 4 radiation power levels (@20mA), the higher the radiation power, the lamp beads made The brighter it is.
D24 radiation power 26-28mW
D25 radiation power 28-30mW
D26 radiation power 30-33mW
D27 Radiated power 33-36mW
The radiation power of D24 and D27 is 8mW, that is to say, the same size of the chip, the brightness of the lamp bead is different, there is a lot of difference, you need to know the radiation power level of the chip.
In fact, the chips currently on the market are graded. The light sources of many packaging factories in Guzhen are clearly divided into A products and B products. Different grades are different prices. Of course, many unfamiliar ones may also take the price of the product of the B product.
2, the difference between the lamp holder material:
At present, there are aluminum brackets, brass brackets, and copper brackets on the market. The aluminum brackets are the cheapest, and the copper brackets are the most expensive, and the price difference is ten times. Even for the copper bracket, the price of silver plating is also high or low. The market is generally called a good bracket, and most of it is made of brass silver.
The difference between the aluminum bracket and the copper bracket is easy to distinguish (get one inside the hand, the light one is aluminum), and now some factories do not use aluminum or iron brackets, of course, no matter what bracket, take a lamp bead to make The damage test will be known. How many purchases will make these, especially for some finished products, even if the lamp beads are not seen, only the finished product.
In fact, I think that many manufacturers' businesses are also very depressed, seemingly the same products, but the prices of raw materials are very different, and customers feel that the price of the same products is lower than yours, and the warranty is the same (warranty) In two years, one situation is that there is no problem within two years, or the problem can be abruptly ignored. In another case, there are often bad products, but the quality assurance is also recognized. This should be a little expensive. Still often have problems, repair the warranty?). 
3, the difference in chip size:
Usually the reported chip size is mil. If there is no high-power measurement microscope, it is generally difficult to distinguish. The bigger the chip is, the brighter the chip is. We can compare the chip size by calculating the chip area, such as 23X10, the chip area is 230 square mil. It is a good idea to distinguish the chip size with the chip area.
For example, the crystal 35 (that is 35*35MIL), now the wafer is pushing the 32*32 chip, the ancient town market is relatively chaotic, many packaging factories said that the wafer 38 did not exist in the first two years, but there is a packaging factory now They are still selling Jingyuan 38; this year's wafer 35 is discontinued to push these 32 sizes, but there are still many packaging factories still selling 35 (and maybe the stock is in stock), but we also found that some people have flicked some newbies. The dizzy of Nadi source is the source of crystal; the chip replacement size we stopped at the chip factory will generally follow the chip factory, because the original will face the shortage of goods, and the other goods that are in stock will not be so reassuring.
4, the difference between wire bonding materials:
The chip and the bracket are connected by gold wire welding method. Currently, there are two kinds of alloy wire and pure gold wire on the market. The pure gold wire is the best. The gold wire is divided into 0.7, 0.9, 1.0, 1.2, etc. according to the thickness. Thick, the lower the heat group, the longer the life, all the material and diameter of the gold wire.
The prices here are very different, and many of the ancient towns selling LED light sources are not manufacturers, but sell them with the manufacturers' goods. He can sell them in several packaging factories. There are cats here. Many people in the ancient town take the light source. Tested, some people like to press the price, such as the crystal Yuan, he said that 8 hairs, you said that 7 hairs and 5 lines can not, he said to look at the amount, and finally you may take you to give you 5 hair 5, but this inside is The alloy wire or the gold wire is doubtful (of course, the ancient town has formed this habit), and they basically have no trouble to sell because of this, because no one is in charge of this.
Note: alloy wire and gold wire are easier to break than working at the alloy wire, which is easier to die, thick gold wire can withstand 60,000 hours, and alloy wire may be less than 30,000 hours, plus The life of the finished lamp is shorter due to other packaging factors, power factor, heat dissipation factor of the casing and environmental factors used.
5, the difference between phosphors :
The white light bulb is made of blue chip and ** phosphor. The phosphor is mainly divided into aluminate and silicate. The performance of aluminate is better than that of silicate. The aluminate is the most representative of YAG. The light decay is low, the chemical stability of the silicate itself is poor, but the brightness is higher than that of YAG. If you want to make the product with stable performance, don't be fooled by the so-called high brightness, which is a big problem.
The quality of the phosphor directly determines the purity and durability of the light color of the light source. Why some light sources change color over time is related to the packaging technology and material.
6, the difference between glue:
The phosphor is to be stirred on the chip after being stirred with the glue. The quality of the glue affects the light decay and color drift. The poor glue time will be yellow, the light decay will increase, and the good glue is the jelly glue.
Some products encapsulated in the packaging factory are sealed on the lamp lens, and the lens holder of the outdoor product is not in place. This happened in the past two years. Now this situation is relatively rare, but there are still .
7. Specifications for color separation, partial pressure and splitting:
Color separation: It is the color temperature bin. For example, 3200K-3350K is a file. The regular package factory will provide the BIN code of color temperature. The smaller the color temperature is, the better the color temperature is. The color consistency of the light source is good. .
Partial voltage: It is the voltage division of the chip, such as 3.0V-3.15V. For the connection mode of the light source in series and parallel, the voltage binning is controlled within 0.15V, so that the current distribution of the light source is uniform, which is beneficial to improve the life of the light source.
Splitting: It is the brightness division of the lamp bead. There is a lumen binning or a light intensity bin. For lighting sources, it is best to use lumen binning. It is recommended to purchase LEDs, or based on light efficiency, high-efficiency products will save energy and have a long life.
In order to save time, some packaging factories have a wide range of color temperature, a large voltage range, and a large brightness range. If a white wall washer is used, the light is inconsistent. In this case, many people in the ancient town may have encountered it, especially in previous years.
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