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Myth - Low voltage = Low Power

Discussion in 'Power Supplies' started by AussiePhil, May 7, 2010.

  1. AussiePhil

    AussiePhil Dedicated Elf Administrator

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    Low Voltage - does not equal - low power usage

    One of the myths of low voltage Halogen lighting.

    The truth is it actually means higher energy usage per watt due to conversion losses in transformers and power supply regulators.

    The reason we aussies have lower power usage than our american friends is generally the much lower wattage incandescant bulbs used in our strings.
    A mini bulb in the US is typically around 240mW to 400mW, this equals the famous 3 series 100ct strings = 1A figure.
    A mini bulb in a Aussie 24v string is around 110mW, giving us around 250 bulbs for 1A at 24v

    However power consuption is roughly calculated as for 1A

    1A at 120v = 120W

    1A at 24v = 24W assuming 75% effeciency via a transformer = 32w required from the 240v supply.
    32w at 240v = 0.133A

    So by the magic of low wattage bulbs we have less current required from the 240v supply.

    Last year i ran 15,000 mixed LED and incandescants as well as 240v Rope light from a single 10A power point, dedicated 16A power circuit though.
     
  2. dmoore

    dmoore Senior Elf

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    Yea yea... but I know deep down inside the Aussies want to switch to 120/60hz. ;)
     
  3. OP
    OP
    AussiePhil

    AussiePhil Dedicated Elf Administrator

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    :D :D :D Absolutely NOT :D :D :D
     

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