How to choose a good LED lamp?
Release date: 2017-10-30 Source: Foreign station sharing: 
At present, the prices quoted by various merchants in the LED lighting market are far apart, and they all say how good their products are. As a layman, how do you judge whether the quality of LED lamps is up to standard? The quality of LED lamps mainly depends on several parameters:
1. Light decay, better LED lamps have a light decay of <30% before 25,000 hours; the main factors determining the light decay are the quality of the light source and the difference in the heat dissipation structure; the high-power light source of the original foreign package, such as the CREE light source. The light decay is better than the light source of the domestic package. As a layman, the light source is generally invisible. The simple judgment method is mainly the price. The foreign original packaged light source is much higher than the domestic packaged light source; therefore, if you want to buy a better quality LED The luminaire must provide manufacturer information for the light source.
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2, light efficiency, that is, the lumens per watt, the unit LM / W, he reflects the power saving performance of the lamps, the better the power saving lamps, the higher the light efficiency. At present, the luminous efficacy of LEDs and the compact fluorescent lamps are almost the same. With the improvement of LED light efficiency, CREE may produce 186 lm/w of light source this year.
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3, the light source, is a high-power LED or straw hat lamp or piranha-type LED; LED lighting uses high-power LED as a light source, the price is higher; and straw hat or piranha type LED price is very cheap, not suitable for lighting The source of the luminaire.
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4, drive power, good drive power can guarantee the life of the overall lamp, the theoretical life of LED is 100,000 hours and the life of the general drive power is less than 100,000 hours; in order to ensure the life of the overall lamp, the drive power is also a key link; On the one hand, the LED must be driven by a constant current. If a low-cost constant voltage drive is used, the service life of the LED will be shortened. How do ordinary consumers recognize the driving power of LEDs? Look at a few parameters, light decay, lifetime, light efficiency, and warranty period. The quality of LED lamps produced by manufacturers who dare to provide long-term warranty is good. Off-the-shelf high-power DC-DC DC converter, DC booster, 36V/48V/60V electric vehicle inverter, electric vehicle intelligent DC converter.
LED lighting options:
First of all, you should be clear about your positioning. Do you need high-end or mid-range lamps ? Consider the quality of LED lamps from several aspects:
1. Chip type, the most advanced domestic use is the US CREE 3 level chip, reaching 15 yuan / W. Followed by Puri and so on, as well as Japan and South Korea. Some chips from Taiwan. Personal recommendation is Puri chip, the price is higher,
2. Light decay Light decay is closely related to the heat dissipation of the lamp and the package of the chip. The package manufacturer should also consider it.
3. Lumen value, now claimed to be able to achieve 130LM / W, personally think that indoor lighting 80-90LM is the most suitable, the technology is also the most mature
4. Color temperature and treatment of the surface of the lamp body
5. Driver This should be said to be a short board that affects the life of LED lamps. Most LED drivers can only be guaranteed for 2 years. That is to say, after 2 years, you can cause the lamp to be off because the drive is broken.
Label: How to choose a good LED fixture?
TFT LCD screens are characterized by good development, high screen, strong sense of layering, and bright colors, but there are also relatively power consumption and low cost. TFT screen technology legendary the development of mobile phone color screens. Many of them support 65536 color displays, and even have 160,000 color displays. With a very high screen TFT, the visual advantage is important.
Technical characteristics
TFT technology was developed in the 1990s. It uses new materials and new processes for fine semiconductor all-electronic manufacturing technology. It is the basis of liquid crystal (LC), inorganic and organic thin-film electroluminescence (EL and OEL) flat panel displays. It is a variety of films made on non-single materials such as glass or plastic products (of course also on the surface) through methods and chemical reaction forming processes, and a large number of micro-integrated circuits (LSIC) are produced through the processing of the films. Non-single crystal crystals can achieve cost reduction, which is an extension of traditional small integration to large area, function, and direction. Manufacturing TFTs that control the switching performance of pixels (LC or OLED) on large glass or plastic products has a higher technical content than manufacturing complete ICs on silicon wafers. The required production equipment and production technology surpass the production of large-scale integration of semiconductors, which is the luster of modern technology. The main features are:
(1) Large area: The first generation of large-area glass products (300mm×400mm) TFT-LCD-production line was put into production at the beginning of the nineties, and the area of eye glass has been expanded to 60mm×80mm in 2000), as well as 950mm×1200mm glass The design will also run.
(2) High integration: The size of the 1.3-inch TFT chip used for the projection of liquid crystal is one million for GA. The resolution is SXGA (1280×100×1280×1000×1280×1000×1280×1000×16.1 inch TFT screen amorphous film) 50nm, and TAB ON GLASS and SYSTEM ON GLASS technology, its IC integration, The technical requirements for equipment and supplier technology are more difficult than traditional LSI.
(3) Powerful function: TFT as a matrix selection solution provides the light valve characteristics of liquid crystal. TFT-LCD is the first Liquid Crystal Display in human history whose display quality exceeds that of CRT. The function will be more powerful, which is unmatched by traditional small integrated circuits.
(4) Design: Glass products and plastic products have fundamentally solved the problem of large semiconductors and opened up potential applications for the application of small semiconductors.
(5) Ingenious process: In addition to the use of vapor phase, chemical vapor deposition (chemical vapor deposition) MCVD (molecular chemical vapor deposition) and other processes to form films, laser flame technology has also begun to be applied traditionally, not only making amorphous films, polycrystalline films, but also Single crystal films can be manufactured. Can make silicon film, can also make other II-VI group and III-V group semiconductor thin film.
(6) Wide range of application fields. Liquid crystal display based on TFT technology is a rich industry in the information society, and the technology can also be applied to the rapid growth of thin-film organic electroluminescence (TFT-OLED) flat panel Display Screen shots. .
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