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Calling all Electricians

  • 31-10-2012 3:44pm
    #1
    JOHN.DREW1983
    Registered Users, Registered Users 2 Posts: 10 ✭


    Why do magnetic ballasts in a florescent light fitting use more power when the tube or starter has stopped working??
    I have a florescent light that takes 2x58W 5ft tubes, the total power for a working light fitting is about 135 W which would be about right taking for account the magnetic ballast.
    But when i change the starters for starters that don't work it raises the power up to 204W.


Comments

  • #2
    DublinDilbert
    Registered Users, Registered Users 2 Posts: 5,401 ✭✭✭DublinDilbert


    The starter normally switches out the heating elements in the cathode after a second or two and the lamp strikes. I would guess that the heating elements are continuously on, but i could be wrong on that one.


  • #3
    JOHN.DREW1983
    Registered Users, Registered Users 2 Posts: 10 ✭JOHN.DREW1983


    So that would mean under normal working conditions the heating elements turn off after the bulb is lit? the tubes are glowing at each end is this the heating elements?


  • #4
    DublinDilbert
    Registered Users, Registered Users 2 Posts: 5,401 ✭✭✭DublinDilbert


    Yea heating elements are only needed for the initial striking of the lamp.

    If you look up the circuit diagram for an old fitting with a starter you should see what the starter does.


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