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    jab751's Avatar
    jab751 Posts: 3, Reputation: 1
    New Member
     
    #1

    May 14, 2014, 01:46 PM
    How to replace burned out switch?
    Cutting the wattage of a 300 watt bulb to 150 watts using a 3 way pull switch and device to drop the wattage.
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #2

    May 14, 2014, 01:50 PM
    Why not a 150 watt bulb? Or a 3 way, 50-100-150?
    donf's Avatar
    donf Posts: 5,679, Reputation: 582
    Printers & Electronics Expert
     
    #3

    May 14, 2014, 01:56 PM
    What is your question?

    A switch will not change either the applied voltage, resistance or amperage so the wattage of the lamp will stay the same
    jab751's Avatar
    jab751 Posts: 3, Reputation: 1
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    #4

    May 14, 2014, 02:10 PM
    I have workbench light with 2 300watt halogen bulbs. Before it burned out, it operated with a SPDT switch @ 150/300watts. The device that was inline with the 1st pull of the switch got burned out beyond recognition, now I do not have drop in wattage. I could not locate the MFG to determine the device that failed. A RESISTOR?
    jab751's Avatar
    jab751 Posts: 3, Reputation: 1
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    #5

    May 15, 2014, 09:28 AM
    Quote Originally Posted by jab751 View Post
    I have workbench light with 2 300watt halogen bulbs. Before it burned out, it operated with a SPDT switch @ 150/300watts. The device that was inline with the 1st pull of the switch got burned out beyond recognition, now I do not have drop in wattage. I could not locate the MFG to determine the device that failed. A RESISTOR?
    donf's Avatar
    donf Posts: 5,679, Reputation: 582
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    #6

    May 15, 2014, 12:56 PM
    Okay, most likely it was a resistor that burned out. Wattage is a statement of heat.

    Is the lamp connected to a 120 V ac circuit or a 240 V ac circuit?

    To calculate the resistance for 300 watts, its is E X E / P or (120 * 120) / 300 = 48 Ohms. For 150 Watts, (120 * 120) /150 = 96 Ohms. So if my math is correct, you would need to place an additional 48 Ohm resistor off the pull switch 1 position to create the necessary reduction to create a 150 Watt output.

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