What factors determine the quality of led tube?
There are many factories producing LED tubes on the market, and the quality of their products varies greatly. The price of LED tubes is transparent and so messy. Each factory has the same specifications and the price difference is tens of yuan/piece. It is an expert. Explain to the guests. It is not easy to understand this huge price difference. Take the T8, 1200MM, 18W LED tube: the market price sells for 55 yuan/piece, and some people sell the price to about 160 yuan/piece, why is the price difference so big? The reason for the different prices is nothing more than the difference in the materials used for the LED tubes. Let us explain from the three main materials that make up the LED tube --- LED light source, power supply, and profile.
One: LED light source: (generally 3528, 2835, 3014, 3020 are used as the main light source)
1: The quality of the light source is good and average, mainly based on the chip used as the core reference. The chips include CREE, Osram, HP, Nichia, and other first-line brands, but many of these chips on the market are parallel imports. It's hard to tell whether it's true or false. In Shenzhen, few manufacturers know how to use it. Second-tier brands include Epistar, Huga, ChiMei, Genesis Photonics, Tekcore, etc. . . These chips are recognized by light source packaging manufacturers as the most cost-effective chips, and they are also the most commonly used.
2: Judgment of the quality of the LED chip: take the size of the chip, such as 7*9mil to 10*23mil, as a reference. The larger the size, the more expensive the relative price and the better the quality; the grade of the chip is: A file, project The prices of products of different grades, such as products, grade B products, wafers, etc., differ by multiples to several times (the appearance and performance of the A product and the specific product chip are difficult to distinguish, let alone how to identify the customer. In fact, the so-called project product, compared with the A product, has a little defect in quality, but it is not a serious quality problem. But no matter what level of chip, after us, we can definitely determine its chip level? We Confident suppliers can’t cheat)
For example, the brightness of the light source used is 7-7.5LM or more for 3528, and dual chips are used for 2835, and the brightness is 15LM or more for a single light. Color rendering index: 75-80; *21mil or more. The quality of the light source belongs to the upper-middle grade. In particular, the normal industry standard for the drive current of the light source 3528 is 20MA. In order to reduce the heat generation of the LED tube, we sacrifice the brightness of part of the light source of the 3528. Instead of driving with a full load of 20MA, we only use 17.5MA to drive. Efforts to increase the brightness of a single light source to about 7.5LM to reduce the "light loss" driven by low current.
In the market, many factories have LED tube light sources with a single brightness of 6-7LM, but because they have no light source packaging capabilities, they require 3528 lamp beads to be as cheap as 6 cents to 1 cent when purchasing light sources. The price can only force relevant LED packaging factories to use small-sized chips such as project products or B-grade products of about 8*15MIL or 10*16MIL. The cost of the 18W tube 288PCS light source is only about 17 yuan to 28 yuan; the upper and middle grade 3528 light source, such as chip Epistar, Guangjia, Chi Mei 8*20 or 9*21MIL, A product, the price is at least 0.15 yuan/ The cost of the light source is 43 yuan/piece. The light source cost gap is 18 yuan to 26 yuan per tube.
2: Market status: The current market LED tubes are mainly 3528, 2835, 3020, 3014 and other specifications
3: Power supply: The power supply of LED fluorescent lamp is divided into two types: 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 risk of electric shock if the load is touched. The advantage of the non-isolated constant current source is that the circuit design is simple and the manufacturing cost is not high.
2. Isolated constant current power supply: refers to the isolation transformer at the input and output ends. But it can isolate the input and output. The advantage of isolating the constant current source is that the circuit design is complicated and the danger of electric shock can be avoided. The disadvantage is that the efficiency of the power supply will be reduced, the manufacturing cost will be high, and the volume will be relatively large.
The prices of the two power supplies are quite different. The non-isolated power supply is 13 yuan/unit, and the isolated power supply is 26 yuan/unit. Explain the quality of the power supply materials to the guests, so that the guests can make the most appropriate choice. Many non-isolated power supplies on the market cost 6 yuan to 9 yuan per unit, and isolated power supplies are 15 yuan to 18 yuan per unit. Some factories use integrated power supplies that are directly welded to the aluminum plate, and the cost is about 2.5 yuan per unit, so, The price of the power supply also differs by about 10 yuan.
Four: profile, structure
At present, LED tubes on the market are basically divided into two types: semi-plastic and semi-aluminum tubes and all-plastic tubes.
1. All-plastic tube: The early LED fluorescent lamp used all-plastic tube, because it mainly used non-isolated power supply, in order to avoid the problem of electric shock, it is more desirable to use all-plastic tube. The biggest problem of this kind of fluorescent lamp is the heat dissipation problem. Because all the heat is sealed in the tube, it cannot be dissipated at all, and the light decay is very serious, so it is not recommended to use it. The price is around 2 to 3 yuan/kit.
2. Semi-plastic and half-aluminum tube: The LED fluorescent lamps sold on the market are basically half of PC and half of aluminum alloy. Plastic is used for the half that needs light transmission, and the half that does not need light transmission but needs heat dissipation. Use aluminum alloy. The power supply is of course placed in 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 this kind of lamp is usually about 20W. The main purpose is to confirm the thickness of the aluminum material, and the heat dissipation effect must be at least 1.0MM or more to reach the standard. At present, the samples from some factories are basically 0.6-0.8MM thick, and the aluminum material is more sub-colored, which proves that there are more impurities. This is generally 5 to 7 yuan/set, quality is guaranteed, usually around 13 yuan/set. The price difference is about 5 yuan/set.
Five: Other
1. Fixed ends: There are many joints on the market at present, including aluminum skin, PC material, and aluminum skin plus PC material. According to the fixing method, there are glue fixed on both ends of the lamp tube, and screws can be used to fix the lamp tube. Two tubes. In terms of safety and environmental protection, the method of fixing with screws is adopted by the majority of consumers. Now it is fixed with hidden test screws, which is very beautiful and high-end.
2. The light transmittance of PC masks: The light transmittance of transparent masks in the market can reach 88-95%, and the light transmittance of fog masks is 70-86%. If the luminous flux of a tube without a mask is 2000lm, and now a transparent mask with a light transmittance of only 88% is added to it, then its actual luminous flux is only 1760lm. If you add a transparent mask with a light transmittance of 95% to it, 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 lies in the material of the mask. At present, the materials of PC masks on the market include ordinary PC materials and optical grade PC materials. Because of the different manufacturers, the difference in light transmittance is quite large.
picture
3. Substrate: At present, the LED chips are surface-mounted on the PCB or aluminum-based electronic circuit board through a certain arrangement, and then fixed on the aluminum alloy radiator. The thermal conductivity of glass fiber PCB is 20w/mk, and the thermal conductivity of aluminum alloy is 200w/mk. The greater the thermal conductivity, the better the heat transfer and heat conduction effect. To judge 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, because the aluminum plate contains many impurities, when cutting the aluminum plate, the knife edge cutting is easy to produce the aluminum plate V-CUT position It is not smooth; the thermal conductivity of aluminum alloy with a lot of impurities will be greatly reduced, of course, the price is much cheaper, under normal circumstances, the price difference is about one-third.
4. Lifespan: The lifespan of the LED tube depends on the quality of the light source, the power supply, and the reasonable combination of aluminum heat dissipation. In the final analysis, in addition to the most basic materials, there is a most basic reference. The light effect, the higher the light effect, to some extent, this lamp does a better job.
The differences in the above-mentioned related materials have caused a huge gap in the price of LED tubes in various factories. For the same T8, 1200MM, 18W LED tube, everyone knows why the price is as large as 40-55 yuan, right? Why does the price of LED fluorescent tubes fluctuate so much? There are differences in materials. All in all, you get what you pay for. Expensive ones may not be good. Good ones will have a relatively higher price. The quality determines the price. Just choose the product that best suits your situation, don't blindly seek low-priced products.
Shenzhen Benwei Lighting Technology Co., Ltd is a professional manufacturer in producing LED lighting products, integrates design, development, production and sales of high-tech products as a whole . Our fcatory was founded in 2010, is located in shenzhen.
Our products: led stadium light, led flood light, led tube, led high bay, led street light, led panel light...
Welcome you inquiry!
