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Thread: Light Dimmer ?????

  1. #1
    DIY Member edlentz's Avatar
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    May 2008
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    Default Light Dimmer ?????

    I just installed a new 3 way dimmer and it works great. The question is: if the lights are at 50% do I use 50% less energy? My wattage is at full power 450 watts. Given that the dimmer gets warm (just) does that mean that the power used is the same?

    Just wondering

  2. #2
    Electrician Chris75's Avatar
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    Lights Dimmed...Saves Electricity.....Makes incandescent bulbs last longer
    10%..................10%........................2 times longer
    25%..................20%........................4 times longer
    50%..................40%........................20 times longer
    75%..................60%........................> 20 times longer
    Last edited by Chris75; 08-18-2008 at 02:45 PM.

  3. #3
    Retired Defense Industry Engineer jadnashua's Avatar
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    With most modern dimmers, the act of reducing the voltage to the lights isn't perfect, but as shown in the previous post, it's fairly linear...you do lose some in the process you'll notice as heat.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  4. #4
    DIY Member edlentz's Avatar
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    I am glad to see that table. I wasn't sure if the heat was the rest of the power disipated. Thanks alot for the replies

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