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Common Faults and Treatment Methods of Fluorescent Lamp
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 −
Type of Fault | Reasons of Fault | Treatment or Repairing Methods |
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The fluorescent lamp does not start. |
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Fluorescent lamp blinking ON and OFF |
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Sometimes the ends of the fluorescent tube remain lighted. | This fault is due to short-circuited starter. | Check the starter switch and replace it. |
Blackening of the end portions of the fluorescent tube. | This fault occurs due to too low or too high voltage. | To resolve this fault, adjust the ballast tapping if provided. |
Dark streaks along the fluorescent lamp. | It is due to mercury globules (or droplets). | To correct this fault rotate the fluorescent tube by 180°. |
Snaking spiraling. (This fault occurs with the glow type starter.) | This fault occurs due to either opening of the starter switch quickly or wrong tapping made on the ballast. |
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Burn out electrodes | This fault occurs due to short-circuit of the choke. | Test with a new choke. |
The brightness of the fluorescent lamp decreases. |
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Large electromagnetic noise from the choke. | It is mainly due to poor quality of the ballast and the large vibrations of the sheets of the iron core. | Re-tighten the iron core of the choke if possible, otherwise replace it. |
Choke overheating |
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