How Fluorescent Lamp (Tube Light) works on DC Supply?

How Tube Light (Fluorescent Lamp) works on DC Supply?

The Fluorescent lamps which is commonly known as Tube light can be operated on DC supply.  

In this post, let us discuss about how to make tube light works on DC supply. 

To make the fluorescent lamp work on DC Supply, a resistance is connected in addition to the usual choke as shown in the following figure.
tubelight_on DC_Supply

  • After adding the extra resistance and connected to DC supply continuously, the positive end of the tube will become blackened.
  • It is due to the migration of ionized mercury vapour to the negative end.
  • To decrease this effect, the input supply terminals have to be changed continuously.
  • To achieve this, a changeover switch is used. Usually a rotary switch is incorporated. It ensures the polarity reversal, every time the fluorescent lamp is switched ON.

The advantages and disadvantages of working tube light on DC supply is given below:


  1. It eliminates the stroboscopic effect.
  2. Power factor correction is not required.


  1. Initial Investment cost is high.
  2. Due to the addition of the extra resistor, power consumption is increased.
  3. Tube light efficiency is decreased.

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How to Identify NPN and PNP Transistor using Multimeter

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