荧光灯比白炽灯省电,因为荧光灯发出的是冷光,它不需要像白炽灯那样,将很多电能转换成热能白白消耗掉。所以,荧光灯的发光效率相当于白炽灯的4倍。但是,人们还想进一步提高荧光灯的发光效率。电光源科学家注意到,荧光灯的发光效率与灯管内壁所用的荧光物质有关。早期荧光灯用硅 Fluorescent lamps save energy as compared to incandescent lamps, because fluorescent lamps emit luminescence, which does not require incandescent lamps to dissipate much of the electrical energy into heat. Therefore, the luminous efficiency of fluorescent lamps is equivalent to four times that of incandescent lamps. However, people also want to further improve the luminous efficiency of fluorescent lamps. Electric light source scientist noticed that the luminescent efficiency of the fluorescent lamp is related to the fluorescent substance used in the inner wall of the lamp. Early fluorescent lamps with silicon