Features and advantages of LED light bulb products
Since 1968, the first LED starts to enter the market, has more than 30 years. With the development of new materials and improved technology, LED tends to highlight and full color. The gallium nitride substrate blue LED appears, it is an extension of the LED applications. Currently the main application areas include large-screen color LED display, lighting, lasers, multimedia, imaging, LCD background light sources, detectors, traffic lights, instrumentation, optical fiber communications, satellite communications, marine and other optical communications as well as pattern recognition, but also it is mainly used for lighting and display.
LED light emission is produced by a superconducting crystal ultra-high intensity light, it emits very little heat, unlike incandescent as waste too much heat, unlike fluorescent lamps, as a result of high energy consumption and produce toxic gases, unlike neon that requirement high voltage and easily damaged. LED has been globally recognized as a new generation of environmentally friendly high-tech light.
LED with high luminous efficacy than traditional neon lights save over 80% electricity, safe and reliable. LED has changed the incandescent tungsten light with energy-saving lamp tri-phosphor emits light, and the use of electric light. LED light source has a long life, high luminous efficiency, no radiation and low power consumption. LED spectrum almost all concentrated in the visible light spectrum, the luminous efficiency of up to 80% to 90%. The LED ordinary incandescent, spiral energy-saving lamps and T5 trichromatic fluorescent lamps were compared, the results show: ordinary incandescent light efficiency is 12lm / W, life expectancy is less than 2000h; spiral energy saving lamp luminous efficiency of 60lm / W, life expectancy is less than 8000h; T5 trichromatic fluorescent light efficiency compared 96lm / W, life is about 10000h; and a diameter of 5mm white LED luminous efficiency of 20 ~ 28lm / W, life can be more than 100000h.
(1) LED lighting products
After the 1879 Edison carbon filament incandescent invention, lighting technology will enter a new era. Recalling the history of the 20th century lighting, fluorescent lamps, mercury lamps, high / low pressure sodium, metal halide lamps, compact fluorescent lamps, high-frequency Promise fluorescent lamps and microwave sulfur and other new sources abound. Incandescent come from that day onwards with congenital defects, tungsten heating large power consumption, lamp fragile, and people are likely to get an electric shock. Although energy-saving fluorescent than incandescent, but detrimental to human vision, the mercury inside the lamp is also harmful to humans and the environment. Real qualitative change caused lighting technology or LED. Compared with the traditional lighting technology, the biggest difference is the different LED structures and materials, it is a way to convert electrical energy into visible light semiconductor, the upper and lower layers with electrodes, the middle conductive material, a light emitting material in the two electrodes sandwich, the color of light depending on the material properties vary.
LED belongs to the whole solid cold light source, smaller, lighter, more robust construction and low voltage, long service life. According to the usual definition of luminous efficiency, LED luminous efficiency is not high, but because of the LED spectrum almost all concentrated in the visible light spectrum, efficiency up to 80% to 90%. The visible efficiency equivalent incandescent light efficiency is only 10% to 20%. The single LED power is generally 0.05 ~ 1W, to meet the different needs through the cluster approach.
LED lighting products is the use of LED as a light source created by the lighting equipment, lighting applications LED product is attracting the world's attention. LED as a new type of green lighting products, it must be the future trend of development in the 21st century will enter the new era of LED lighting as the representative.
(2) Advantages of LED light source
① new green light: LED cold light use, small glare, no radiation, use does not produce harmful substances. LED operating voltage is low, DC drive, ultra-low power consumption (single tube 0.03 ~ 0.06W), electro-optical power conversion close to 100%, under the same lighting effects than traditional energy sources more than 80%. LED environmental benefits of better, no ultraviolet and infrared spectra, and recyclable waste, no pollution, no mercury elements, safe touch, typical of green lighting.
② Long life: LED solid cold light source, epoxy resin, anti-vibration, light body and no loose parts, there is no filament light easy to burn, heat deposition, the light fades and other shortcomings, the service life of up to 60,000 to 100,000 hours, which is more than 10 times the life of traditional light sources. LED performance stable, can work normally under -30 ~ + 50oC environment.
③ more transformation: LED light source can use red, green, and blue color theory, under the control of computer technology to make three colors with 256 gray levels, and any mix can produce 256X256X256 (ie 16777216) colors to form a different light color The combination. LED light color changing combination, can achieve a variety of dynamic changes and various image effects.
④ high-tech: Compared with traditional light sources glow, LED lighting is low voltage microelectronic products, the successful integration of computer technology, network communication technology, image processing and embedded control technology. Chip size conventional LED lamps used for 0.25mmX0.25nm, while the size of the LED lighting are generally required in 1.0mmX1.0mm above. Working desktop structure LED die molding, inverted pyramid structure and flip chip design can improve the luminous efficiency, thereby emitting more light. LED package design innovations include high conductivity base metal block, flip-chip design and bare disc casting type lead frame, these methods can design a high-power, low thermal resistance of the device is, and illumination of these devices than conventional LED greater illumination products.
Currently a typical high-flux LED device capable of producing a few to tens of lumens lumens, updated design to integrate more LED in a single device, or install multiple devices in a single assembly, so that the number of lumens output equivalent to a small incandescent lamp. For example, a high-power monochrome LED chip device 12 can output 200lm light energy, the power consumed between 10 ~ 15W.
LED light source applications is very flexible and can be made into a point, line, face various forms of portable products; LED control is extremely convenient, as long as the current adjustment, you can freely adjust the light; a great variety of different combinations of light and color, the use of timing control circuit better achieve a variety of dynamic effects. LED lighting has been widely used in various devices, such as battery-powered flash, miniature voice-activated lights, security lighting, outdoor and indoor stairs road and building lighting and marking continuous lighting.
The emergence of white LED is a substantial step towards identifying features from the LED lighting function is taken. White LED closest to the sun, more better reflect the true color of the object is irradiated, so from a technical point of view, the white LED is undoubtedly the most cutting-edge LED technology. Currently, white LED has begun to enter some application areas, emergency lights, flashlights, flash, and other products have come out, but because the price is very expensive, and therefore difficult to spread. White LED on the premise that the popularity of price decline, while prices fell in the white LED must form a certain size of the market after the possible integration of the two ultimately depends on technological progress.