Fluorescent lamps are low-pressure glow-discharge lamps in which the energy of a gas discharge released in the lamp is converted into visible light over the fluorescent substance coated on the inside of the glass tube. By means of the different chemical composition of the fluorescent substance, practically any spectral composition of the emitted light can be achieved. With their lifespan of up to 55,000 hours when using appropriate ballasts and a high light efficiency, fluorescent lamps are among the most economical light sources of all.

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