Fluorescent lamps rely heavily on phosphors to produce light, and their performance has evolved significantly over time. Before the 1950s, most fluorescent lamps used calcium halophosphate, also known as halogen powder. While this material was cost-effective, it had several limitations—such as low luminous efficiency, poor thermal stability, significant light degradation, and a low lumen maintenance rate. These drawbacks made it unsuitable for use in modern compact, thin-tube fluorescent lamps. In 1974, Philips of the Netherlands introduced a breakthrough in phosphor technology by developing a three-component phosphor system. This included cerium oxide (emitting red light at a peak wavelength of 611 nm), magnesium polyaluminate (emitting green light at 541 nm), and bismuth magnesium aluminate (emitting blue light at 450 nm). Together, these materials formed what is now known as rare earth trichromatic phosphors. This innovation significantly improved the performance of fluorescent lamps, with an average luminous efficiency exceeding 80 lm/W—about five times that of traditional incandescent bulbs. The color temperature could be adjusted between 2500K and 6500K, and the color rendering index reached around 85, making the light more natural and comfortable for human eyes. The introduction of rare earth trichromatic phosphors marked a major milestone in the development of fluorescent lighting. Without this advancement, the modern compact, high-efficiency fluorescent lamps we see today would not have been possible. However, one major drawback of these phosphors is their high cost, which limits their widespread use in some applications. Despite this, their energy-saving benefits and superior light quality have made them a cornerstone of modern lighting technology. Uv Aire Bulb,Metal Halide Uv Lamp,Cheap Uv Lights,Sterile Air Uv Lights Guangdong Kingrate Optoelectronic Technology Co., Ltd. , https://www.kingrateuv.com