Now the price war of LED has been sold, the product quality is even more uneven. A 1.2M fluorescent tube is from ten yuan to hundreds of yuan, but the appearance is similar, but it has nearly ten times the price difference. What is the difference between this? How can consumers judge the difference in quality? Can low prices really achieve good quality? Is there a balance between price/performance and quality?
Fortunately, Mr. Li, a senior engineer who has been engaged in LED industry technology for 15 years (hereinafter referred to as Li Gong), randomly evaluated and dismantled the T8 fluorescent tube of a LED factory with good reputation in Shenzhen. This is a common plastic tube in the market. It looks the same as the ordinary plastic tube on the market. We first use the integrating sphere to test its photoelectric color parameters:
The parameters are: power: 17.3W; PF: 0.52; luminous flux: 1711.2LM; luminous efficacy: 98.92LM/W; color rendering index: 73.5; color temperature: 6516K.
"In addition to the PF value is lower, some other parameters are good for medium-effect, just look at the materials used." Li Gong evaluated according to its data.
The lamp cap is snap-on, which is easy to assemble and repair and can be easily opened without any tools. There is an aluminum material in the lamp tube (commonly known in the industry: plastic-coated aluminum), which can solve the heat dissipation problem of the LED well, can effectively delay the light decay, and achieve the effect of prolonging the service life of the lamp. The aluminum substrate used for the circuit board has a good heat dissipation overall structure.
Li Gong took a careful look at the circuit board and said, "This should be the national standard substrate of 1016. The material is good. The failure of one line after the first and last lines will not affect other lamp beads."
This T8 tube uses 96 2835 0.2W lamp beads to further test the quality of the lamp bead. Li Gong holds the magnet on the lamp bead to further detect the lamp bead material, but the lamp bead does not reflect. Holding the ferrochrome Take the lamp bead and use the scissors to scrape off the bottom plating layer. Hold the tweezers and pick out the colloid inside the lamp bead and put it under the electron microscope. After a while, say: "The obvious red copper bracket, pure gold wire, chip size visual inspection. Not less than 10*20, the lamp beads are really good."
Overall, this lamp is more moderate, we will test it below and evaluate its real life in depth:
According to our test of the working temperature and life of the capacitor (if the operating temperature of the capacitor drops by 10 degrees on the basis of 105 degrees, the lifetime is doubled), that is, its operating temperature is 95 degrees, it is 10,000 hours, 85 degrees. 15,000 hours, 20,000 hours at 75 degrees, and 25,000 hours at 65 degrees. At an ambient temperature of twenty degrees, its operating temperature is below 65 degrees, and when the ambient temperature is raised to 41 degrees, its temperature is 68 degrees. That is to say, according to the 16 hours a day, 365 days a year, its theoretical life is four and a half years.
Li Gong summarized this product based on its materials and test results:
Disadvantages: ordinary shape, low PF value, single voltage (170-265V) can not pass EMC and safety;
Advantages: The three cores of circuit board and power supply and lamp bead are real, the product quality is stable, the light effect is high, the light is uniform, and there is no stroboscopic damage to the eyes. (2.5) The normal use of two years of light decay should be less than 15%.
According to the market situation, Ligong estimated the cost: 6 yuan for the outer casing, 2.2 yuan for the PCB, 98*0.08=7.84 yuan for the lamp bead, 2.5 yuan for the power supply, 3 yuan for the labor cost, 1.8 yuan for the package, and the loss and management cost of renting water and electricity. Etc., the total cost should be around 25 yuan, plus 20% profit and the current LED market is generally used in the price war, the market price of this lamp should be around 28 yuan.
Fortunately, Mr. Li, a senior engineer who has been engaged in LED industry technology for 15 years (hereinafter referred to as Li Gong), randomly evaluated and dismantled the T8 fluorescent tube of a LED factory with good reputation in Shenzhen. This is a common plastic tube in the market. It looks the same as the ordinary plastic tube on the market. We first use the integrating sphere to test its photoelectric color parameters:
The parameters are: power: 17.3W; PF: 0.52; luminous flux: 1711.2LM; luminous efficacy: 98.92LM/W; color rendering index: 73.5; color temperature: 6516K.
"In addition to the PF value is lower, some other parameters are good for medium-effect, just look at the materials used." Li Gong evaluated according to its data.
The lamp cap is snap-on, which is easy to assemble and repair and can be easily opened without any tools. There is an aluminum material in the lamp tube (commonly known in the industry: plastic-coated aluminum), which can solve the heat dissipation problem of the LED well, can effectively delay the light decay, and achieve the effect of prolonging the service life of the lamp. The aluminum substrate used for the circuit board has a good heat dissipation overall structure.
Li Gong took a careful look at the circuit board and said, "This should be the national standard substrate of 1016. The material is good. The failure of one line after the first and last lines will not affect other lamp beads."
This T8 tube uses 96 2835 0.2W lamp beads to further test the quality of the lamp bead. Li Gong holds the magnet on the lamp bead to further detect the lamp bead material, but the lamp bead does not reflect. Holding the ferrochrome Take the lamp bead and use the scissors to scrape off the bottom plating layer. Hold the tweezers and pick out the colloid inside the lamp bead and put it under the electron microscope. After a while, say: "The obvious red copper bracket, pure gold wire, chip size visual inspection. Not less than 10*20, the lamp beads are really good."
Another tube core: power supply
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Overall, this lamp is more moderate, we will test it below and evaluate its real life in depth:
According to our test of the working temperature and life of the capacitor (if the operating temperature of the capacitor drops by 10 degrees on the basis of 105 degrees, the lifetime is doubled), that is, its operating temperature is 95 degrees, it is 10,000 hours, 85 degrees. 15,000 hours, 20,000 hours at 75 degrees, and 25,000 hours at 65 degrees. At an ambient temperature of twenty degrees, its operating temperature is below 65 degrees, and when the ambient temperature is raised to 41 degrees, its temperature is 68 degrees. That is to say, according to the 16 hours a day, 365 days a year, its theoretical life is four and a half years.
Li Gong summarized this product based on its materials and test results:
Disadvantages: ordinary shape, low PF value, single voltage (170-265V) can not pass EMC and safety;
Advantages: The three cores of circuit board and power supply and lamp bead are real, the product quality is stable, the light effect is high, the light is uniform, and there is no stroboscopic damage to the eyes. (2.5) The normal use of two years of light decay should be less than 15%.
According to the market situation, Ligong estimated the cost: 6 yuan for the outer casing, 2.2 yuan for the PCB, 98*0.08=7.84 yuan for the lamp bead, 2.5 yuan for the power supply, 3 yuan for the labor cost, 1.8 yuan for the package, and the loss and management cost of renting water and electricity. Etc., the total cost should be around 25 yuan, plus 20% profit and the current LED market is generally used in the price war, the market price of this lamp should be around 28 yuan.
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