Mercury lamp is an electric light source that uses mercury vapor generated during mercury discharge to obtain visible light.Mercury lamp can be divided into low-pressure mercury lamp, high-pressure mercury lamp and ultra-high pressure mercury lamp.When the low-pressure mercury lamp is ignited, the vapor pressure of mercury is less than one atmosphere, and the main radiation wavelength of mercury atom is 253.7 nm ultraviolet light.The inner wall of the commonly used "fluorescent lamp" tube is coated with calcium halide phosphate phosphor, and then the ultraviolet light is converted into visible light.The inner wall of energy-saving fluorescent lamp is coated with rare earth phosphor, which has higher luminous efficiency.
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