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 inexpensive, it had several drawbacks, such as low luminous efficiency, poor thermal stability, significant light decay, and a low lumen maintenance rate. These limitations made it unsuitable for use in compact, thin-tube fluorescent lamps that became popular later. In 1974, Philips from the Netherlands introduced a breakthrough by developing a three-component phosphor system composed of cerium oxide (which emits red light with a peak wavelength of 611 nm), magnesium aluminate (which produces green light at 541 nm), and bismuth magnesium aluminate (which emits blue light at 450 nm). This rare earth trichromatic phosphor offered much higher efficiency—over 80 lumens per watt, which is about five times more efficient than traditional incandescent bulbs. It also provided a wide range of color temperatures (2500K–6500K) and a high color rendering index of around 85, making it ideal for energy-saving lighting applications. The introduction of this advanced phosphor marked a major milestone in the development of fluorescent lighting. Without the three-primary phosphor, it would have been impossible to create the modern, energy-efficient, compact fluorescent lamps we see today. However, one major downside of these rare earth-based phosphors is their high cost, which limits their widespread use in some regions or lower-cost products. Single Tube Uv Sterilizer,Uv Sterilizer For Water Disinfection,Uv Sterilizer For Water,Uv Sterilizer For Fish Pond Guangdong Kingrate Optoelectronic Technology Co., Ltd. , https://www.kingrateuv.com