LED Drivers on Lighting Circuit

Discussion in 'Electricians' Talk' started by bourlon, Jan 14, 2020.

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  1. bourlon

    bourlon New Member

    Got some led's and drivers for the kitchen, for each driver there will be 2 rolls of tape, 72 watts each, a total of 3 amps, and there will be 2 drivers in the kitchen circuit.

    This seems a bit close. I would appreciate the readers thoughts.
     
  2. Bob Rathbone

    Bob Rathbone Screwfix Select

    Firstly, when using the LED on a roll system, you need to be aware that the sticky tape is useless. It will slowly come unstuck, so use an additional fixing such as staples carefully placed over the strip with a piece of insulating material between. I agree that the rating is close, but as it does not exceed the PSU output, it should be OK.
     
  3. Mike58

    Mike58 Screwfix Select

    144W of LED lights - have you checked to see how bright that will be? That is probably in excess of 1kW incandescant equivalent.
     
  4. bourlon

    bourlon New Member

    These we specified by a specialist LED supplier, they will be on a dimmer - now need to check the capacity of the dimmer!!
     
  5. Bazza

    Bazza Screwfix Select

  6. bourlon

    bourlon New Member

    I spoke with the supplier's tech dept. The input power is only 1/10 th of the output.

    Thanks everybody
     
  7. Mike58

    Mike58 Screwfix Select

    Absolute RUBBISH ... how can the ouput power be 10x greater than input unless they have discovered "free energy".
     
  8. Eney

    Eney New Member

    I agree, will put a camp meter on see what the true value is.
     
  9. Bazza

    Bazza Screwfix Select

    Maybe they said current , not power?
     
  10. Hans_25

    Hans_25 Screwfix Select

    Power in = power out. Energy can neither be created nor destroyed.
     
  11. MGW

    MGW Screwfix Select

    You say 72 watt each and total 3 amp so that means 12 volt so the input current is only 1/20 th of the output. So even if they said current not power, there is something wrong?
     
  12. Eney

    Eney New Member

    they are 24 volts
     
  13. Bazza

    Bazza Screwfix Select

    Yes, in a transformer power in = power out

    But the current will change in an inverse ratio to the voltage change.
    Your transformer has a voltage change ratio of 10:1, so the current will be 10 times higher on the 24v side than the 240v side.
    You misheard, or misunderstood what you were told.
     
    Eney likes this.
  14. Mike58

    Mike58 Screwfix Select

    Yes, but not always as "electrical power" some will be lost as heat and maybe sound.
     
  15. Bazza

    Bazza Screwfix Select

    Was hoping to avoid having to go through the minutiae of transformer losses in what (should be) a simple matter.
     
    Last edited: Jan 18, 2020
    Hans_25 likes this.
  16. Hans_25

    Hans_25 Screwfix Select

    240 volts at 1 amp = 240 watts

    At 24v volts for the same power, current will be 10 amps. At 12 volts for the same power current will be 20 amps. That's why I bought 24v LED strips not 12V :)
     
    Eney likes this.

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