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.
Take a deep breath, close your eyes, the world has the freshest oxygen ... Yu Quan's "Deep Breath" is well known to us, but as the environmental problems become more and more serious, the haze sky also increases, PM2.5 PM10 and so on Vocabulary has also been mentioned more and more, and air purifiers have quickly become popular on the market with this "air quality" trend. Along with this, the air-clean brand has sprung up, and various technologies are dazzling. Which ones are indeed effective and which are just tasteless propaganda? How does the Air Purifier bother us to get rid of pollution? And look at the editors for you.
Analysis of air purifier
The critical value of PM2.5 content is 75 μg / m3
The pollutants in the air mainly include soot, total suspended particulates, inhalable particulates (PM2.5) and fine particulates (PM10). The smaller the diameter of the particulates, the deeper the part that can enter the respiratory tract. 10 micron diameter particles It is deposited in the upper respiratory tract, and particles below 2 microns can penetrate 100% into the bronchiole and alveoli.
1k-5k air purifier prices vary greatly
The air purifier products on the market not only have various functions, but also have prices ranging from thousand yuan to tens of thousands. The pricing of imported products is generally higher than that of domestic brands. Except for the core technology of many brands, the promotion of purification effects is similar, and consumers need to choose according to demand.
The air quality standard of 74 key cities is only 4.1%
According to the data of the press conference held by the State Council Information Office on June 4, according to the new "Ambient Air Quality Standards", the six pollutants SO2, NO2, PM10, PM2.5, CO and O3 were evaluated, 74 new standards In the first phase of monitoring and implementation, the proportion of cities that met the ambient air quality standards was only 4.1%, and the other 256 cities implemented the old air quality standards, and the proportion of cities that met the standards was 69.5%.
Air purifier sales increased by 90.5% compared with last year
According to a report recently released by the China Electronics and Information Industry Development Institute, due to the haze weather, air purifiers have become the most concerned home appliance products, with sales of nearly 2.4 million units nationwide last year, a year-on-year increase of 90.5%; retail The amount reached 5.6 billion yuan, a year-on-year increase of 105.9%.
HEPA filter needs to be replaced in March
The filter of the air purifier is the same as the filter of the water purifier, and it is not effective for a long time. After long-term use, the accumulation of dust on the surface of the filter will also cause the filter to gradually fail. Therefore, when the haze is more serious, the non-washable HEPA filter needs to be replaced every three months.
Merchants claim that the purification rate is more than 99% for the concept of stealing
99% or even 99.99% seems to have become a slogan for many air purifiers on the market. Many brands of products promote their high removal rate of PM2.5 and formaldehyde. In fact, this kind of publicity is more of a kind. The slogan of stealing the concept, the removal rate of 99% is the effect of the material itself on PM2.5 and formaldehyde, not the effect of actually running in space.
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Ningbo Zhe Kai Electric Appliance Co.,Ltd , https://www.cnairpurifiers.com