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A low-pressure mercury vapor gas discharge lamp that uses fluorescence effect to produce visible light is known as fluorescent lamp or fluorescent tube.
There are some common faults in case of the fluorescent lamps. These faults, their reasons and treatment methods are described in the following table −
Loose and defective holders.
Defective fluorescent tube.
Defective starter switch.
Defective choke.
Turn the tube through 90° and check the connections and holders.
Replace the tube.
Try another starter switch / replace the starter switch.
Replace the choke.
Loose contacts.
Wrong circuit connections.
Low supply voltage
Defective starter.
Defective fluorescent tube.
Check all the connections.
Change the ballast tapping if required.
Replace the starter switch.
Replace the fluorescent tube.
To resolve this fault, replace the starter or ballast.
In case of new fluorescent tube, this fault automatically cures after few days.
Low power supply voltage.
Aging of the lamp tube.
If the power supply voltage is low, then check the power supply and correct it.
If lamp tube is aging, it needs to be replaced with a new one.
Poor ventilation and heat dissipation.
Inter turn short circuit of the internal coil of the choke.
Provide proper ventilation and heat dissipation.
If inter-turn short-circuit, then replace the ballast with a new one.
