A fluorescent lamp is a low-pressure mercury discharge lamp used as a light source. It consists of a fluorescent body, the basis of which is most often a long glass tube with incandescent electrodes, filled with mercury vapor and argon. A glow discharge occurs in them, which, however, shines mainly in the invisible ultraviolet region. This radiation falls on the walls of the tube, which are usually covered with a phosphor. This substance absorbs ultraviolet radiation and itself shines in the visible region. The fluorescent lamp thus shines.
For a gas discharge, the higher the current, the smaller the voltage drop across the discharge. Therefore, the current through the fluorescent lamp connected in the circuit must be limited in a suitable way, e.g. by a series resistor, a choke (in AC circuits) or an electronic ballast . The main part of the fluorescent lamp consists of a fluorescent tube containing mercury vapor and argon, and at both ends there are bases with metal electrodes.
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Advantages of fluorescent lamps








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