Tube Light connection diagram

Last Updated on April 8, 2024

Tube lights are most used light source and here tube light connection circuit and wiring diagram given with explanation. Connection of tube light is very simple because it has few wiring points only. Tube Light connection diagram shown here is suitable for common type fluorescent tubelight.

What is Tube light?

The tube light or fluorescent light is a low pressure mercury vapor gas discharge lamp and it uses fluorescent to produce white light.

Tube light wiring diagram

tubelight wiring diagram

Electronic Ballast Tube light wiring diagram 

Connection and Working

  We need tube light, ballast, starter and fluorescent light holders to make wiring connection. The fluorescent tube has two filaments with four terminals the starter is connected between two filaments, the ballast is connected between main Ac supply and one filament in tube light.

Here  another terminal in tube light is directly connected to the AC supply, to ionize the mercury atoms in the tube light starter element is used, after the ionization operation of starter is does not need for fluorescent lamp. the ballast employed to convert the AC supply frequency to high frequency and the ballast regulates the supply given to the tube light.

Electronic Ballast Choke Tube light wiring is simple as normal tube light or it is even simple. Here we don’t need to have starter element we can directly connect electronic choke or electronic ballast to the mains power supply and then output terminals to the tube light right and left holder that’s it.

Sample Electronic Ballast ( Electronic Choke )

Glowing Tube light

tube light in action


  • Tube lights are mostly made with glass and it is fragile, proper handling is must.
  • Tube light sockets or holders are apparatuses that firmly grasp fluorescent tubes and establish electrical connections to illuminate the lights. These sockets are available in two conventional dimensions one is T8 and another one T12, denoting the respective tube diameters they can hold.
  • You should firmly rotate the tube (use proper insulation) to make it contact inside the sockets terminals. Once starts glowing, firmly check the holding and leave.
  • Don’t use Ceiling Duster or cloth attached stick to clean tube lights. Have a plastic chair or wood table and use Dry cloth (in switch off Condition) to clean the tube if necessary.

13 thoughts on “Tube Light connection diagram

    1. Hi Voneski
      Starter or Glow starter placed parallel to the tube filament contains small neon lamp with fixed contact, bi metallic strip and small capacitor. The Starter Provides current flow path to the filament of tube at the initial time. It becomes inactive after the gas ionization and current flow in the tube.
      starter for tube light

    1. Hi rita,
      Tube light blinking occurs at starting because the Starter circuit tries to make current flow in the tube gas. Once the gas in tube ionized means then current flow occurs and tube will start continuous glowing.

  1. why the small lamp required inside the starter.if the small lamp removed from the starter what will happen.

  2. The purpose of the choke is to provide a very high voltage initially between the filaments (across the two ends of the tube light). Again once the gas in the tube is ionized the choke provides a low voltage. Initially when choke induced high voltage, is the same voltage in induced across the switch? If yes the n how switch withstand with high voltage?

  3. I have two tubes in series on an arrangement with two T5 tubes I have replaced ballast tubes and starters but I still cannot get to work.

    1. Hi Olivia jepkogei
      While both chokes and ballasts may include an inductor as a key component, the primary difference lies in their specific applications. Chokes are employed in a wide range of electrical circuits to control or filter AC current, whereas ballasts are specifically used in lighting systems to regulate the current and provide the necessary voltage for lamp operation. Hope you understand.

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