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Thread: voltage 12v 14.7v

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    voltage 12v 14.7v

    hi
    bought 2 new lights
    installed both lights but 1 light is not working, other light is working fine
    now the seller is saying its my fault the light is broke because my power supply gives 14.7 voltage and his light is only 12v
    which seems like a lot of bul to me?
    what you guys think?
    thank you

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    Mod Squad Bama Rambler's Avatar
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    Re: voltage 12v 14.7v

    Which lights do you have?
    LED light's are more sensitive to voltage differences, but a 12 volt rated light should be able to stand a couple volt variance.
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    Re: voltage 12v 14.7v

    yes led light
    I measure around 13.9-14.4 volts

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    Re: voltage 12v 14.7v

    Quote Originally Posted by Bama Rambler View Post
    Which lights do you have?
    LED light's are more sensitive to voltage differences, but a 12 volt rated light should be able to stand a couple volt variance.
    Not necessarily true but we can't say without knowing more about the LED bulbs you bought. Some poorly designed LED bulbs will not survive running 2.7 volts above their rating.
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    Mod Squad Bama Rambler's Avatar
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    Re: voltage 12v 14.7v

    We really need to know the brand and model of the lights purchased.
    Dave J. TFP Moderator
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    Mod Squad Bama Rambler's Avatar
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    Re: voltage 12v 14.7v

    Unfortunately they don't give any specs on the ± voltage allowed. 12 volts AC or DC is all that's given.
    Dave J. TFP Moderator
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    Re: voltage 12v 14.7v

    Where did you measure the voltage, at the light or at the transformer?

    Do you have any documentation on the lights? Do they specify the voltage requirements?

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    Re: voltage 12v 14.7v

    12V transformers for pool lights do not have a regulated output. An unloaded transformer will have a higher output voltage is no load is applied than if there is a load. The amount of the load will determine the output voltage. LED lights have a much smaller load than incandescent lights do, so will not bring down the transformer output voltage as much as higher load incandescent lights will. Also, a higher wattage transformer will be less affected by load than a smaller transformer would be.

    When you told your supplier that you transformer was putting out 14.7 Volts, where did you measure the voltage at?
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    Re: voltage 12v 14.7v

    Quote Originally Posted by gary300 View Post
    12V transformers for pool lights do not have a regulated output. An unloaded transformer will have a higher output voltage is no load is applied than if there is a load. The amount of the load will determine the output voltage. LED lights have a much smaller load than incandescent lights do, so will not bring down the transformer output voltage as much as higher load incandescent lights will. Also, a higher wattage transformer will be less affected by load than a smaller transformer would be.

    When you told your supplier that you transformer was putting out 14.7 Volts, where did you measure the voltage at?
    I am surprised that you did not mention wire size as well. At these low voltages, the actual wire run could drop the voltage delivered to the light depending on the AWG size.
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