Energy-saving lamps are also called compact fluorescent lamps (referred to as CFL lamps abroad). They were first invented by foreign manufacturers in 1978. Due to their high luminous efficiency (5 times that of ordinary light bulbs) and obvious energy-saving effect, With the advantages of long life (8 times that of ordinary light bulbs), small size, and ease of use, it is valued and welcomed by people and countries all over the world.
Energy-saving lamps mainly heat the lamp filament through the ballast. When the temperature is about 1160K, the filament begins to emit electrons (because some electronic powder is coated on the filament). The electrons collide with the argon atoms to produce non-ionic electrons. Elastic collision, argon atoms gain energy after collision and then collide with mercury atoms. After absorbing energy, mercury atoms transition and generate ionization, emitting ultraviolet light of 253.7nm. The ultraviolet light excites the phosphor to emit light. Because the temperature of the filament when the fluorescent lamp is working is about 1160K, which is higher than that of incandescent lamps. The working temperature of the lamp is much lower, 2200K-2700K, so its lifespan is also greatly improved, reaching more than 5,000 hours. Since it does not have the current heating effect like incandescent lamps, the energy conversion efficiency of the phosphor is also very high, reaching more than 50 lumens per watt. . A 7-watt three-color energy-saving lamp has the same brightness as a 45-watt incandescent lamp, and its lifespan is eight times that of ordinary incandescent bulbs.
In 1906, the world first used a battery-powered electric light for lighting.
In 1909, acetylene lamps were used as light-changing devices for the first time.
In 1916, the United States used driving lights.
In 1920, when the reverse gear device was selected, reversing lights were used.
In 1920, General Motors of the United States was the first to install interior lights.
In 1926, General Motors moved the headlight dimmer switch from the steering wheel to the floor.
In 1938, enclosed interior lights were used for the first time.
In 1898, the American Electric Company promoted parabolic reflectors for electric lamps in headlights, side lights and tail lights