Double Tube Light Circuit Diagram

Last Updated on March 16, 2024

As we know the tube light is a low pressure mercury vapor gas discharge lamp or otherwise called as fluorescent light and mostly produce white light, Now a days CFL and LED lighting products are produced in large scale even though LED lights cannot replace tube lights thoroughly, because the tube light gives smooth bright light, but till now LED  can’t.

This Article gives a details about double tube light connection by using single ballast or choke, (some electronic choke not support this connection) check the ballast specification and watts level before make this type of connection.

Wiring Diagram

Here two tube lights are used, in our case each one is 20 watts, each tube light will have two filament with four terminals, connect starter element to any on side of tube light , after that link phase line to the Ballast (choke) through switch. Connect the other terminal of Ballast to terminal of first tube light then connect tube light 2 with first one serially as show in the illustration. Finally bring neutral terminal from tube light 2.

For single tube light connection refer here.

Take extra care and safety measures while handle high AC supply


starter placed parallel to the tube filament contains small neon lamp like setup 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.

Ballast or Choke

This is a electric device which is produce high voltage by using low frequency AC voltage.  It helps the tube light mercury vapor gas to ionize and after ionizing, this ballast or choke reduces the output voltage level.

6 thoughts on “Double Tube Light Circuit Diagram

    1. The advantage is the increased system efficiency (less power wasted in the single ballast vs double ballast setup).

        1. BOLLOCKS, to minimise strobe effect lights need to be on different phases of three phase supply.
          Tubes on the same phase will flicker simultaneously no matter how connected

  1. Dual neons in one ballast cand have a backdraw, it can start up slower, taking more time to fully engage. Lamps need to be same age/performance, starters too.

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