Electric light sources come in various types, each with its own unique structure. However, they typically consist of several common components. These include filaments or electrodes that generate light, phosphors that emit visible light when excited, and materials like glass, translucent ceramics, or quartz tubes that serve as the outer casing. Additional elements such as guide wires, stems, and lamp holders help in the assembly and connection of the lamp. Inside, gases, mercury, metals, and halides are often used as fillers to enhance performance. Other components like getters, coatings, insulators, and adhesives play a crucial role in maintaining stability and safety. When evaluating electric light sources, there are six main performance indicators to consider. First, the light quantity characteristics, which include total luminous flux, brightness, light intensity, ultraviolet radiation levels, and heat emission. Second, light color characteristics, covering aspects like color temperature, color rendering index, chromaticity, and spectral distribution. Third, electrical characteristics such as power consumption, lamp voltage, current, starting performance, and electromagnetic interference. Fourth, mechanical properties including dimensions, structural design, and lamp holder compatibility. Fifth, economic factors like luminous efficiency, lifespan, cost, and energy expenses. Lastly, psychological aspects such as visual appeal and user comfort, which influence how people perceive and interact with the lighting. Long Working Distance Microscope Long Working Distance Microscope,Binocular Dental Microscope,Dental Video Microscope,Digital Microscope Ophthalmic Ningbo Huaguang Precision Instrument Co., Ltd. , https://www.hgopt.com