How to judge the quality of LED tubes
First, LED light source: (generally use 3528, 2835, 3014, 3020, 5630 as the main light source) 2: LED chip quality judgment: take the size of the chip, such as 7*9mil to 10*23mil for reference, the larger the size, the more expensive the relative price, the better the quality; the level of the chip is as follows: A file, project Products, B-grade products, wafers and other grades of products, the price difference is multiplied to several times (the specific distinction between the appearance and performance of the A product and the special product chip, the insider is also difficult to distinguish, not to mention how to identify In fact, the so-called project, compared with the A product, is a little flawed in quality, but it is not a serious quality problem. But no matter what level of chip, after various rigorous tests, we can definitely judge its chip level is what! In summary: to judge the quality of the chip, we must first look at the chip brand? Then confirm whether the size of the comparison chip is the same or similar, and finally confirm that the chip level is A product? Special product? B file? Wafer? Regardless of the brand, the same grade of chips, the price is actually very small, in other words, whether it is the crystal, Sanan, Guangjia, Chi Mei, Taigu, New Century chips, as long as the A-class products, the chip size is the same Quality is no different. The quality is high and low to confirm the accessories used in the LED package, such as the thickness of the silver layer of the bracket? What is the quality of silica gel? The quality of the phosphor? Dispensing process control, etc. . . In terms of chip packaging, Zhongzhi Optoelectronics has 5 years of experience. In order to ensure quality, all imported materials are purchased in the auxiliary materials, such as Dow Corning for glue, Infinex for phosphor, 1.2MM gold wire and so on. Judging the quality of the LED light source from the parameters, mainly how high is the brightness? How high is the index? Is consistency good? In the market, more factories have LED tube light sources, and the brightness of single lamps is also 6-7LM. However, because they do not have the light source packaging capability, when purchasing the light source, they also require 3528 lamp beads to be cheap to 6 cents to 1 cent. The price can only be compared with the related LED package factory with small size chips such as 8*15 MIL or 10*16 MIL or B products. 18W lamp 288PCS light source cost only 17 yuan to 28 yuan; middle and upper grade 3528 light source, such as chip wafer, Guangjia, Chi Mei 8 * 20 or 9 * 21 MIL, A product, the price is at least 0.15 yuan / The cost of the light source is 43 yuan / support. The cost of the light source is 18 yuan to 26 yuan per lamp. Two: Power: The power of LED fluorescent lamps is divided into non-isolated and isolated. 1. Non-isolated constant current power supply: Non-isolated means that there is a direct connection between the load end and the input end, so there is a danger of electric shock when the touch load is applied. The advantage of the non-isolated constant current source is that the circuit design is simple and the manufacturing cost is not high. The disadvantage is that the high voltage of the AC power source is introduced to the load end, which may cause electric shock. 2. Isolated constant current power supply means that there is isolation transformer isolation at the input and output terminals. But both can isolate the input and output. The advantage of isolating the constant current source is that the circuit design is complicated and the risk of electric shock can be avoided. The disadvantage is that the efficiency of the power supply will be reduced, the manufacturing cost is high, and the volume is relatively large. The price of the two power supplies is quite different. Non-isolated power supply 13 yuan / piece, isolated power supply is 26 yuan / month, to explain to customers the quality of power supply materials, so that guests make the most appropriate choice. Many non-isolated power supplies on the market are 6 yuan to 9 yuan / piece, isolated power supply 15 yuan to 18 yuan / piece, some factories use integrated power supply, directly soldered on the aluminum plate, the cost is about 2.5 yuan / piece, so, The price of the power supply is also about 10 yuan. The power supply above the photo is the latest solution, and it is the patch process (our power supply) Obviously see the difference High-quality power supply, with built-in IC intelligent control (I use imported IC) The following is our lamp power supply, imported IC intelligent control, patch technology, independent power supply scheme to ensure the stability of the lamp in use Three: profiles, structures LED lamps on the market are basically divided into two types of profiles: semi-plastic semi-aluminum tubes and all-plastic tubes. 1. All-plastic tube: The early LED tube adopts the all-plastic tube. Because it mainly uses non-isolated power supply, in order to avoid electric shock, it is more desirable to use all-plastic tube. Compared with other profile lamps, the heat dissipation is relatively poor. 2, aluminum-plastic lamp tube, also known as semi-plastic semi-aluminum tube: LED fluorescent lamps sold on the market are basically half of this PC half aluminum alloy, the plastic used in the half that needs light transmission, does not need light transmission The half that needs heat is made of aluminum alloy. The power supply is of course placed inside the aluminum tube, so that the heat generated by the LED plus the heat generated by the power supply is quite large, because the power of the lamp is usually around 20W. Mainly to confirm the thickness of aluminum, at least 1.0MM above the heat dissipation effect to reach the standard, I have confirmed some factory samples, the thickness is basically 0.6-0.8MM, and the aluminum material is more sub-color, it proves that there are more impurities, this kind Generally it is 5 to 7 yuan / set, the quality is guaranteed, usually about 13 yuan / set. The price difference is about 5 yuan / set. Four: Other 1. Fixed end: There are many joints on the market at present. There are aluminum skin, PC material, aluminum skin and PC material. It is fixed at the two ends of the lamp with glue. It is also fixed with screws. Two tubes. In terms of safety and environmental protection, it is used by the majority of consumers with screws. 2. Transmittance of PC mask: At present, the transmittance of the transparent mask of the market can reach 88-95%, and the transmittance of the mist mask, also known as the diffusion mask, is 70-86%. If the luminous flux of a lamp without a mask is 2000 lm, and now it is given a transparent mask with a light transmittance of only 88%, then its actual luminous flux is only 1760 lm of luminous flux. If you add a transparent mask with a transmittance of 95%, then its actual luminous flux is 1900lm, which is also a transparent mask. Why is there such a big difference between the two? The answer is on the material of the mask. At present, the material of the PC mask on the market is ordinary PC material and optical grade PC material. The difference between them is quite large due to the difference in manufacturers. In order to improve the light efficiency, our PC purchases a new imported fireproof PC material, which not only improves the light transmittance, but also improves the fire retardant coefficient to ensure the safety of the product. Therefore, it is favored by many factories, shopping malls and supermarket customers. The following set of pictures, for our PC cover (diffuse cover transmittance of 85-90%, transparent cover transmittance of 90-95%), in the reduction, light transmission, flame retardancy is far higher Inferior PC cover. 4, life: LED lamp life, mainly depends on the quality of the light source, power supply, aluminum heat dissipation and other aspects of the reasonable mix, in the final analysis, in addition to the most basic materials, there is a basic reference is Light effect, the higher the light efficiency, to some extent, the light is better. The difference between the above related materials has caused a huge gap between the LED lamps of various factories. The same LEDT8, 1.2m 18W lamps, we understand why the price will be as big as 40-55 yuan, right? Why the price of LED fluorescent tubes fluctuates greatly, and there are differences in materials. All in all, if you pay for a penny, expensive is not necessarily good, good will definitely be relatively high, and what kind of quality determines what kind of price. You can choose the product that best suits your situation. Don't blindly seek high-priced or high-parameter products. The price does not explain everything. The most important thing is to choose the product according to your actual situation. If the low-end inferior product is used in the home (lighting 3-5 hours per day), the service life is 1-2 years is no problem; if it is used in factories and shopping malls (lighting more than 10 hours per day), the life expectancy is only half a year to one year. . So everyone has to choose the quality of the product according to the situation. Finally, regarding the after-sales, I would like to make some friendly tips: The products on the market have a warranty of 1 year, 2 years of warranty, 3 years of warranty, 10 years of warranty and so on. There are several problems here, the scope of warranty, after-sales cycle, warranty costs and so on. Body Bag,Storage Big Bag,Disposable Body Bags,Waterproof Body Bags Ningbo Anbo United Electric Appliance Co.,ltd , https://www.airfryerfactory.com
1: The quality of the light source is good and general. The chip can also be used as a reference. The chip has CREE , Osram, HP, Nichia, and other first-line brands. The second-line brand has Epistar, Sanan, Tsinghua. Tongfang, Huga, ChiMei, Genesis Photonics, Tekcore, etc., but these chips, many on the market are parallel imports, true and false. These chips are recognized by our light source packaging manufacturers as cost-effective chips, and are also the most commonly used. The optoelectronics production headquarters in the packaging plant in the majority of the use of wafers and other chips as the main chip provider.
The products below are traditional in-line process, and the heat dissipation effect is poor; the solution is backward and the compatibility is poor.
The power supply in the figure is the built-in power supply of the lamp, the upper part is the high-quality power supply, and the lower part is the inferior power supply.
The difference is that the solution is old, the power supply is large and consumes electricity, the power supply efficiency is low, the process is old, and the heat dissipation effect is poor.
3. Substrate: At present, the LED chip is attached to the PCB or aluminum-based electronic circuit board through a certain arrangement, and then fixed on the aluminum alloy radiator. The thermal conductivity of the glass fiber PCB is 20w/mk, and the thermal conductivity of the aluminum alloy is 200w/mk. The greater the thermal conductivity, the better the heat and heat transfer effect. Judging the quality of the aluminum plate, it is necessary to confirm whether the aluminum plate contains impurities. On the one hand, whether the V-CUT position of the aluminum plate is smooth or not, when cutting the aluminum plate, since the aluminum plate contains more impurities, when cutting the aluminum plate, the V-CUT position of the aluminum plate is easily generated when the blade is cut. Not smooth; the thermal conductivity of aluminum alloys containing a lot of impurities will be greatly reduced, of course, the price is also much cheaper, in general, the price difference is about one-third. In order to ensure the heat conduction effect, our company firmly uses an aluminum substrate with a thermal conductivity of 1.5. PCB boards and FR4 epoxy boards are used by some inferior manufacturers to reduce costs.
1.2mm thick aluminum substrate used by our company
a. The scope of the warranty is that the product cannot be properly lit during use, and it can be applied for after-sales. However, these inferior products will have more quality problems, but the lamps are not bright or the light decay is serious. The problem, the seller is unable to give you replacement or after-sales. (Our company's warranty range, any problems can be sold later)
b, after-sales cycle, the general store after-sales cycle should be 7-15 days, some manufacturers should also be in about 7 days. Of course, some manufacturers will be longer. (Our company's after-sales time is 48 hours)
c. Warranty fees, some manufacturers are slogans with a warranty of 5 years and 10 years. In fact, more often, when problems occur, they will ask for some labor or parts costs. (Our warranty is not charged at all, the warranty is 3 years.)
In summary. Finding a qualified supplier is not easy. Especially for some enterprises, the cost of factory renovation and commercial transformation procurement is relatively large, so we need to be very cautious in supplier selection and product selection. Our company is a high-tech enterprise specializing in LED packaging and LED lighting. From research and development, production, sales and after-sales, we strive to minimize the cost of lighting for each customer and provide the highest quality LED lighting.