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LED power supply

Discussion in 'Electrics UK' started by baggielad, 12 Oct 2021.

  1. baggielad

    baggielad

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    I have a set of these LED strip lights which you can cut into lengths

    https://www.screwfix.com/p/bendable-5m-led-tape-light-10w-1200lm/959fx

    But only one power supply. It's rated at 12v 1a, so I was wondering can I use any power supply that is 12v and at least 1a, or is there a specific type which drives LED lights? I have some old power supplies from old modems and ot
     
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  3. bernardgreen

    bernardgreen

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    Those LED strips will work from a DC constant voltage supply, the resistor determines how much current will flow through the 3 LED elements.

    Do NOT use a constant current LED "Driver" which will force excessive current through the diodes.

    LED strip.jpg

    Although rated at 12 volts these strips will still be bright when supplied from a 9 volt supply. The reduced current will extent the life of the strips
     
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  4. winston1

    winston1

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    Just make sure the power supply you use is regulated. Some can go to above 16 volts on low load.
     
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  5. ericmark

    ericmark

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    You ask a good question, in your case 12 volt or less no problem, however I bought a set from Lidi, and with the kit was a link so you can add a second set, but the power supply is only good enough to power one set.

    I bought two sets, and they are far brighter than I expected. Had I read the box 22 watt does give one a clue, lucky mine are dim-able.
     
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  6. baggielad

    baggielad

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    Many thanks for the replies. Is there some symbol on the power supply that states if it's a regulated/constant voltage and not supplying a constant current?
     
  7. winston1

    winston1

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    Best way is to measure the output voltage on no load. If it is not 12 v within half a volt or so don’t use it.
     
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  8. 333rocky333

    333rocky333

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    Constant voltage will likely have just 12Vdc on it whereas constant current tend to have two voltages like 18v-48v for example, as the voltage adjusts to keep the current constant
     
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