The mercury vapor pressure is less than one atmosphere when ignited, and the mercury atom mainly emits ultraviolet light having a wavelength of 253.7 nm. The commonly used "fluorescent lamp" tube is coated with a calcium halophosphate phosphor, which converts the ultraviolet light into visible light. The inner wall of the energy-saving fluorescent lamp is coated with rare earth phosphor, and the luminous efficiency is higher.
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