How to save energy with LED lights? What is the principle?

The scientific name of energy-saving lamp is compact tricolor electronic fluorescent lamp (CFL lamp for short), which was first invented by foreign manufacturers in 1978. Because of its high light efficiency (5 times that of ordinary light bulbs), obvious energy-saving effect, long service life (8 times that of ordinary light bulbs), small size and convenient use, it has been valued and welcomed by countries and people all over the world. It was introduced in China by 1982. Firstly, the Institute of Electric Light Source of Fudan University successfully developed SL compact fluorescent lamp. In the past twenty years, the output has increased rapidly and the quality has improved steadily. The country has promoted it as a national key energy-saving product (green lighting product).

The working principle of energy-saving lamps is to heat the filament through ballasts. At the temperature of about 1 160K, the filament begins to emit electrons (because some electron powder is coated on the filament), and the electrons collide with argon atoms to produce inelastic collisions. After argon atoms collide, they gain energy and then collide with mercury atoms. After absorbing energy, mercury atoms undergo jump ionization and emit 253.7nm ultraviolet rays, which excites the phosphor to emit light. Because the temperature of fluorescent lamp filament is about 1 160K, which is much lower than that of incandescent lamp (2200K-2700K), its service life is greatly prolonged, reaching more than 5000 hours. Because it does not have the current thermal effect of incandescent lamp, the energy conversion efficiency of phosphor is also very high, reaching more than 60 lumens per watt.

The light efficiency of ordinary incandescent lamp is about 0/0 lumen per watt/kloc, and its service life is about 2000 hours. Its working principle is that when the lamp is connected to the circuit, current flows in the filament, and the thermal effect of the current makes the incandescent lamp emit continuous visible light and infrared light. This phenomenon can be detected when the filament temperature rises to 700K, and most of the energy is wasted in the form of infrared radiation.

Besides white light, energy-saving lamps also have yellow (warm) light. Generally speaking, under the same wattage, energy-saving lamps save 80% more energy than incandescent lamps, prolong their average life by 6-8 times, and radiate only 20%. Under non-strict conditions, a 5-watt energy-saving lamp can be regarded as a 25-watt incandescent lamp, a 40-watt 7-watt energy-saving lamp and a 60-watt 9-watt energy-saving lamp.

For a long time, some places and manufacturers have blindly launched energy-saving lamp projects. Because the capital, technology, raw materials and technology are not fully implemented, the product quality can not be guaranteed, and the product quality of each enterprise is unbalanced. Some manufacturers don't produce according to the process requirements, and assembly plants choose unqualified lamps and components to make up for them, which leads to low quality and low price, seriously damaging the reputation of energy-saving lamps, low luminous efficiency, short service life and poor consistency, resulting in social production stoppage.

After more than 20 years of development, the manufacturing technology of energy-saving lamps in China has made great progress and improvement, and many products have approached or reached the advanced level abroad. They are competitive in the international market because of their high quality and low price. However, there are still a large number of energy-saving lamp manufacturers in the market, regardless of national laws and regulations and the interests of consumers. Because of its low quality and low price, each price is only about 5 yuan, and consumers' recognition of products is limited. In rural areas and most cities, there is still a large part of the market. Because most of the market is occupied by low-grade products, it is difficult for good energy-saving lamps to enter the market, which brings green lighting promotion.