![]() The circuit diagram of a fluorescent lamp is shown Figure-2. The lamp filament is connected to a starter switch which is a small cathode glow lamp with bimetallic strip at the electrodes. A choke is also connected in series with the tube filament that provides a voltage impulse for starting the fluorescent lamp and once the lamp is started, it acts as a ballast. The electrodes are of spiral form, made of tungsten and coated with an electron emitting material. The tube is filled with a small amount of mercury vapor and a small amount of argon gas.Īt both ends of the tube, the electrodes are attached. Thus, due to low pressure, the lamp is made in the form of a long tube whose inside walls are coated with some phosphor. The fluorescent lamp is a low pressure mercury vapor lamp. The basic construction of a fluorescent tube lamp is shown in Figure-1. When an electric current is passed through the fluorescent tube, it excites the mercury vapor which produces UV rays that then causes a phosphor coating on the inside of the lamp to glow. A fluorescent lamp, also called fluorescent tube, is a low pressure mercury vapor gas-discharge lamp that works on the principle of fluorescence to emit visible light.
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