LED is a kind of solid-state semiconductor device, which can directly convert electricity into light. LED energy-saving lamp is a high-brightness white light-emitting diode light source with high luminous efficiency, low power consumption, long service life, easy control, maintenance-free, safe and environmentally friendly; It is a new generation of solid cold light illuminator with soft, bright, colorful, low loss, low energy consumption, environmental protection, suitable for families, shopping malls, banks, hospitals, hotels, restaurants and other public places for a long time lighting. No flash DC, which plays a very good role in protecting eyes, is the best choice for desk lamp, flashlight.
LED, the heart of LED is a semiconductor wafer, one end of the wafer is attached to a bracket, one end is negative, the other end is connected to the positive electrode of the power supply, so that the whole wafer is encapsulated by epoxy resin. The semiconductor wafer consists of two parts, one is P-type semiconductor, in which holes dominate, and the other end is N-type semiconductor, mainly electrons. But when these two semiconductors are connected, a P-N junction is formed between them. When the current acts on the chip through the wire, the electron will be pushed to Zone P. In zone p, the electron will compound with the hole, and then the energy will be emitted in the form of photons, this is the principle of LED lighting. Because the heating capacity of LED lamps is not high, the electric energy is converted into light energy as much as possible, while ordinary lamps convert a lot of electric energy into heat energy due to the large heating capacity, which is wasted in vain. In contrast, LED lighting is energy-saving.
As a category of LED general lighting, LED energy-saving lamps are named from traditional lighting bulb and energy-saving lamps. The appearance of LED energy-saving lamps is similar to that of traditional energy-saving lamps, which can meet the traditional aesthetic standards of consumers. Features of LED energy-saving lamps: low cost, high luminous efficiency, large luminous area, no glare and no ghost.
-Industrial lighting technology plays a leading role and supporting role in IT and BIO revolution;
-LED is a new light in the 21st century, and its application and research have developed rapidly;
-LED technology in South Korea and East Asia is ahead of the world market (accounting for 70% of the world market);
-The huge wave of LED technology will be the second revolution in the history of human lighting;
-In the next five years, LED technology will become a substitute for white heat lamp, fluorescent lamp and halogen light fixtures.
-LED lights accounted for 16% of the world lighting market in 2010.
-1879 Edison invented electric lamp;
-1938 fluorescent lamp came out;
-Published halogen light fixtures 1959;
-1961 high voltage sodium lamp came out;
-1962 metal halide lamp;
-1969 first LED light (red);
-1976 green LED lights;
-1993 blue LED lights;
-1999 White LED lamp;
-2000 LED is applied to indoor lighting.
-The development of LED is the second revolution since the development history of white heat lamp lighting for 120 years.
-Since the 21st century, LED developed through the wonderful encounter between nature, human beings and science will become the innovation of the Light World and the essential green technology light revolution for human beings.
-LED will start a huge light Revolution again electric bulb after Edison invented it.
LED lighting is mainly based on high-power white light LED single lamp. The world's top three LED lighting manufacturers 3-year warranty, with large particles greater than or equal to 100 lumens per watt and small particles greater than or equal to 110 lumens per watt. Light attenuation large particles are less than 3% per year, light attenuation small particles are less than 3% per year.
LED solar street lights, LED floodlights, LED ceiling lights, LED fluorescent lights can be produced in batches. For example, a 10-watt LED fluorescent lamp can replace a 40-watt ordinary fluorescent lamp or an energy-saving lamp.
More and more led energy-saving lamps have entered the homes of ordinary people, but they are not yet popular!
There are many kinds of LED energy-saving lamps, and there are basically three types on the market:
Class I: LED energy-saving lamps made of straw hat type low-power LED, the power supply adopts resistance and capacitance step-down circuit. Straw hat LED continues to use the encapsulation form of indicator LED and epoxy resin encapsulation, which makes the LED chip unable to dissipate heat and has serious light decay. Many white LEDs have a high color temperature after being used for a period of time, it gradually turns blue and becomes dim. Some manufacturers are also committed to developing straw hat LED with low light decay, but since the packaging form has not been changed, the light decay has not been greatly improved. This kind of LED energy-saving lamp products are transitional products with low price and poor quality.
Class II: LED energy-saving lamps made of 3528 or 5050 SMD small and medium power LED, the power supply also generally adopts resistance and capacitance step-down circuit, and some manufacturers also use constant current circuit, compared with Straw Hat LED, SMD LED has a slightly better heat dissipation, with a thermal conductive substrate, which can export part of the heat with aluminum base plate. However, due to the neglected heat of LED, many medium-power SMD LED energy-saving lamps still use plastic shell without radiator, and the light decay is still serious. Low-end power supply with resistance and capacity step-down is adopted. Due to unstable grid voltage, current fluctuation, brightness fluctuation, moderate price and slightly better quality.
Class III: LED energy-saving lamps made of high-power SMD LED, the power supply generally adopts constant current isolation circuit, that is, there is a constant current, such as 5W LED, usually 5 pieces of 1 watt LED chip, in series, the current source with a constant current of 300mA is used for power supply, and the wide voltage power supply makes the current unchanged when the power grid fluctuates. The luminous flux, that is, the brightness, remains constant. Five SMD LEDs are welded above aluminum base plate, aluminum base plate combined with the radiator, the Heat used can be quickly dispersed in time to ensure that the temperature of LED chip is lower than the allowable junction temperature of LED, thus ensuring the true actual life of LED energy-saving lamps. This kind of LED lamp has high price and good quality, which is also the development direction of LED energy-saving lamp.
A good LED energy-saving lamp should be composed of four parts: high-quality LED chip, constant current isolated power supply, relative to the appropriate radiator of lamp power, the light diffusion effect is soft and does not see the lampshade of point light source.