Many factories on the market, product quality is very different, LED lamp prices transparent and seven countries so chaotic, the same specifications marked on each factory, the price difference of several dozen yuan / support, is the expert, to explain to the guests clearly This huge price difference is not easy either. Take T8,1200MM, 18WLED lamp example: the market price of 55 yuan sold / support, some people sell the price of about 160 yuan / piece, why the price difference so big? The reason for the price difference is nothing more than the difference between the LED lamp material. Let's explain the explanation from the three main materials that make up the LED lamp --- LED light source, power supply and profile.
A: LED light source (generally used 3528,2835,3014,3020 as the main light source)
1: The quality of the light source is good and general, mainly using the chip as the core reference. The chips include CREE, Osram, Hewlett-Packard, Nichia and other first-tier brands. However, most of the chips on the market are parallel, True or false, in Shenzhen, not a few manufacturers will use. Second-tier brands include Epistar, Huga, ChiMei, GenesisPhotonics, Tekcore, etc. These chips are the proven cost-effective chips for light source package manufacturers, Also the most commonly used.
2: LED chip quality judgments: the size of the chip size, such as 7 * 9mil to 10 * 23mil other dimensions for reference, the larger the size, the more expensive the relative price, the better the quality; chip grades such as: A file, the project Products, B files, wafers and other different grades of products, the price difference of doubled to several times (A product and the appearance of the chip project, the performance of the specific distinction, it is difficult to distinguish between insiders, not to mention the guests how to identify In fact, the so-called project, compared with the A product, the quality of a little small defects, but not a serious quality problem.But no matter what level of chip, the package, you can determine the level of its chip?
To sum up: to judge the quality of the chip, we first look at the chip brand? Then confirm the size of the comparison chip is the same or similar size, finally confirm the chip level is A product, project, B file, wafer? Regardless of the brand, the same grade of chips, the price is actually a very small difference, in other words, whether it is crystal, Guang Jia, Chi Mei, Thai Valley, the new century chips, as long as the A-class products, the same chip size, the quality is There is no difference. High and low to confirm the LED packaging materials used, such as the stent cross the silver layer thickness, the quality of silica gel, phosphor quality, dispensing process control, etc. ... Judging from the parameters of LED light source quality, mainly brightness is how high? Indication is how high? Consistency is good?
The market, more factories LED lamp light source, single brightness is also 6-7LM, but because they do not have the light source package, when purchased light source requires 3528 lamp beads cheap to 6 cents to 1 cents a, this The price, can only force related LED packaging plant with small-size chips such as 8 * 15MIL or 10 * 16MIL about the project or B files. 18W lamp 288PCS light source cost is only 17 yuan to 28 yuan; in the grade of 3528 light source, such as chip chips, Guang Jia, Chi Mei 8 * 20 or 9 * 21MIL, A product, the price is at least 0.15 yuan / Piece, light source cost 43 yuan / branch. Light source cost gap is 18 yuan to 26 yuan each lamp.
Second: the market situation
Currently the market LED lamp 3528,2835,3020,3014 and other specifications based, why do not I use the factory 3014 light source, mainly 3014 cost is not good, but why so many people on the market with 3014 light source? As we all know, the wattage of 3528 is 0.0625W /, usually driven below 20mA, which belongs to low power light source. 3014 is 0.1W, with 30mA driver lit, belonging to small and medium-power light source, generally 10 * 30MIL about small and medium-power chips, the price is more expensive to 100 yuan per K, using such a chip package 3014, the cost is too high, Cost is not good, so I do not plant 3014 LED light source. 3014 light source on the market, more is about 120-150 yuan / K cost, we dissected more factories using LED lamp 3014 light source, the chips are used with low-power chips, such as 8 * 15MIL, 10 * 16mil, 10 * 23mil-based, with 30mA driver lit, has exceeded the current range of low-power chips, although the brightness of a single is about 11LM, brightness, wattage is pushed by the current, coupled with 3014 stent Although the size of the 3014 bracket has a so-called "heat sink", it has been over-heated for long periods of time due to over-current drive. The light failure is prone to occur. It is destined to exhibit light fades faster in future use . Some factories use such a 3014 reason, mainly a lamp, the same is 18W, 3014 less than 100 light source, we have calculated that a lamp can save about 20 yuan cost of light.
Three: Power LED fluorescent lamp power is divided into non-isolated and isolated two
1. Non-isolated constant current power supply: Non-isolated means that there is a direct connection between the load terminal and the input terminal, so there is a danger of electric shock when touching the load. The advantages of non-isolated constant current source circuit design is simple, manufacturing costs are not high. The disadvantage is that high voltage AC power will be introduced to the load side, causing the risk of electric shock.
2. Isolated constant current power supply: refers to the input and output isolation transformer isolation. But can isolate the input and output. The advantage of isolating the constant current source is the circuit design is complicated, can avoid the danger of electric shock. The disadvantage is that the power efficiency will be reduced, manufacturing costs are high, the volume is relatively large.
Two kinds of power prices vary greatly. Non-isolated power 13 yuan / month, isolated power is 26 yuan / month, to explain to the guests the quality of power supplies, so that guests make the most appropriate choice. Many non-isolated power on the market is 6 yuan to 9 yuan / month, isolated power 15 yuan to 18 yuan / month, some factories with integrated power supply, direct welding on the aluminum, the cost is about 2.5 yuan / month, so, Power supply price difference of about 10 yuan a.
Four: profiles, structure
LED lamps on the market now basically divided into two profiles: semi-plastic aluminum pipe and plastic lamp.
1, plastic lamp: The early LED fluorescent lamp is used plastic lamp, because the main non-isolated power supply, in order to avoid electric shock, so I hope all plastic lamp. The biggest problem with this fluorescent lamp is the heat problem, due to all the heat sealed in the tube, can not be dispersed to the light is very serious, not recommended. The price is 2 to 3 yuan / kit.
2, semi-plastic aluminum tubes: LED fluorescent lamps are now sold on the market are basically half of this half of the PC aluminum, in the need to use the light half of the plastic, in the need to pass the heat does not need light that half Aluminum alloy Of course, power is placed inside the aluminum tube, so that the heat of the LED plus the power of the heat is quite large
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