How the Flourescent light works

It may be the most brilliant way of illuminating our houses
and it’s in use till date. Yes, I am are talking about
fluorescent lights, which offer a more energy efficient
means of lighting our homes and offices. Wonder why they hum?

    Learn how they work here.

In the mid-1930s when first fluorescent tube lights were
introduced in the market, they were a total revelation.
People were amazed to see their houses lit as brightly as
cool daylight. These tube lights immediately replaced the
age old “hot” incandescent bulbs and to date are still the
major way of lighting our cities.

    What’s Inside a Fluorescent Tube Light?

      A fluorescent lamp basically consists of a long glass gas
      discharge tube. Its inner surface is coated with
      phosphorous and is filled with an inert gas, generally
      argon, with a trace of mercury.
      The tube is then finally sealed at low pressure with two
      filament electrodes each at its both ends.
      These electrode filaments are used to preheat the tube
      and initiate a rapid conduction of electrons between the
      two end electrodes. The process initially requires a
      relatively high amount of power.
      The bombardment of these electrons on the inner
      phosphorous coating is instantly transformed into a
      visible bright light, when we ultimately find the tube
      glowing brightly.
      Once the conduction of electrons between the electrodes
      is complete, no more heating of the filaments is required
      and whole system works at a much lower current.

    HOW DOES IT FUNCTION

      From the circuit diagram above, we have seen the components of the fluorescent.
      *Choke – The choke is in fact a large inductor. It consists of a long
      copper winding over iron laminations.

      *An inductor by nature always has a tendency to throw
      back the stored current in it, every time the power
      through it is switched OFF. This principle of the choke is
      exploited in lighting a fluorescent tube light.

      *When an AC voltage is applied to a tube light fixture, the
      voltage passes through the choke, the starter, and the
      filaments of the tube.

      *The filaments light up and instantly warm up the tube.
      The starter holds the current for a moment and then
      releases to break the circuit.

      *This forces the choke to” kick back” it’s stored current,
      which again passes through the filaments and ignites the
      tube light.

      *If the tube does not sufficiently charge up, subsequent
      kicks are delivered by the choke due to rapid switching of
      the starter, so that finally the tube strikes.

      *After this the choke only acts like a low impedance
      current limiter to the tube as long as the light is kept
      illuminated.

    Hopefully this discussion provided you with sufficient information regarding how fluorescent lights function. If you have further questions, feel free to join in a discussion in comments.

      written by Anthony aka Tonisage

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