Connect with us


Discussion in 'Lighting' started by Dave Walsh, Sep 14, 2003.

Scroll to continue with content
  1. Dave Walsh

    Dave Walsh Guest

    Ok, am comming from a noise boy background, and dipping into lighting
    technology. Am surious, what is the funtion, theory behind a Ballast?.
    Or can you point me in the direction of a website explaining these?

    thanks for yer time
  2. AC/DCdude17

    AC/DCdude17 Guest

    X-No-Archive: Yes


    To provide sufficient voltage to start up. Once started, the lamps will
    let current through like an avalanche and function of a ballast after
    starting is to restrict the current.

    The simplest of all is the simple series inductor.
  3. Actually the simplest ballast of all is a series resistor, which
    limits lamp current but does not provide any additional voltage for
    starting. Resistor ballasts are not used very often because they have
    much higher power loss than inductors, but I know of two commercial
    products that do or did use resistor ballasts.
  4. Zak

    Zak Guest

    Fluorecent 'handy lights' come to mind, with a resistive power cord that
    got pretty warm when the lamp was operating. No idea how they handles
    starting though. This was on 220 volts.

  5. GE sells a lamp called Bright Stik (R) that uses a resistive ballast
    extruded into the plastic back plane to operate an T20T12 lamp. The
    system uses a glow starter and the starting voltage of this lamp is
    low enough in pre-heat mode that no inductive kick from the inductor
    is necessary, even with a 120 Vrms line. (Well, there may be a small
    spike from the resistor since it is not wound to be non-inductive.)

    I have also seen a Japanese lamp that uses a small Circline lamp with
    a resistor mounted in the center and an integral Edison base. This
    also works with a glow starter and no inductor.
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day