Controllable Light Dimmer for Halogen Lamp

Discussion in 'The Projects Forum' started by donaldm444, Aug 21, 2012.

  1. donaldm444

    Thread Starter New Member

    Jul 16, 2010
    23
    0
    Hi,
    I want to control the intensity of a 1000 W halogen light (120 V AC) using the output of an analog output card from my PC (0 - 10 V, 0 - 5 V etc.). I have come across some voltage controlled dimming circuits, but I wanted to see if any one had any suggestions.

    Thanks
    Don
     
  2. JDT

    Well-Known Member

    Feb 12, 2009
    658
    85
    donaldm444 and Sensacell like this.
  3. donaldm444

    Thread Starter New Member

    Jul 16, 2010
    23
    0
    Hi,
    Thank you for this link, it is very interesting. In the data sheet, it says resistive loads only, do you know if halogen lamps will cause any problems? I am operating the halogen off the main line (120 V AC) so I don't think there should be a large amount of inductance.
     
  4. KMoffett

    AAC Fanatic!

    Dec 19, 2007
    2,574
    230
    The "halogen cycle" in the lamps depend on having a very hot glass envelope. If you lower the average voltage to the lamp, the glass does not get to the proper temperature. This results in a darkening of the inside of the glass due to the tungsten deposit that should have evaporated and returned to the filament. This will also result in thinning of the filament and a shorter lamp life.

    Ken
     
    Last edited: Aug 21, 2012
    donaldm444 likes this.
  5. JDT

    Well-Known Member

    Feb 12, 2009
    658
    85
    A halogen lamp is a resistive load.
     
    donaldm444 likes this.
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