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Discuss Help with led problem! in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. hoppy
    Offline

    hoppy Regular EF Member

    Location:
    Liverpool
    Hi

    I have been to replace 2 bathroom wall lights from mr16 to 2 new led lights, however due to wiring issues, I have had to put the transformers in the loft. The lights will not
    work and I believe it is due the the length of the existing 12v cables and the fact the new led lights do not draw enough current to make them
    work. When I put my voltage testers across one of the transformers in the loft, the light it feeds works.
    is there anything I can get to make these lights work, and would I fit it at the transformer or the fitting itself?


    thanks

    craig
     
  2. GEOFF S
    Offline

    GEOFF S Electrician's Arms

    Location:
    MARS
    Hi

    Transformers or drivers?

    Cheers
     
  3. happyhippydad
    Offline

    happyhippydad Member Electrician's Arms

    Location:
    Gloucestershire
    Is there no way you can change them to GU10's? What sort of cable is sticking out of the wall, a piece of small 2 core flex or 1mm T&E and what CSA is it? How long is the run from loft to where the lights are? Plus, as above are you using a transformer or LED driver?
     
  4. Simonslimline
    Offline

    Simonslimline Electrician's Arms

    Location:
    South West, Bath
    What kind of voltage tester is it out of interest?
     
  5. marc8
    Offline

    marc8 Electrician's Arms

    Location:
    Essex
    Business Name:
    MTS Electrical Ltd
    what location was the original transformer, have you come of the secondary of the transformer or have you come of the mains?

    if you have come of the secondary how far have you extended the cabling ?
     
  6. davesparks
    Offline

    davesparks Forum Mentor

    Location:
    guildford
    Change the transformer for a constant voltage driver.
    Or fit a dummy load such as the danlers resloade
     
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  7. Lagentium
    Offline

    Lagentium Regular EF Member

    Location:
    West Yorkshire
    Also check if the driver/transformer requires them to be wired in series or parallel
     
  8. davesparks
    Offline

    davesparks Forum Mentor

    Location:
    guildford
    The op suggests that they are 12V units so obviously they would need a constant voltage supply and be wired in parallel.

    Constant current supplies require the loads to be connected in series
     
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  9. Lagentium
    Offline

    Lagentium Regular EF Member

    Location:
    West Yorkshire
    Obviously Dave, you my friend are the Spark God
     
  10. davesparks
    Offline

    davesparks Forum Mentor

    Location:
    guildford
    Not at all, but when it's something that needs basic knowledge taught in secondary schools then it should be obvious to anyone
     
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  11. Lagentium
    Offline

    Lagentium Regular EF Member

    Location:
    West Yorkshire
    I bow down to your superior knowledge, I'm sure it has caught many people out before though
     
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  12. davesparks
    Offline

    davesparks Forum Mentor

    Location:
    guildford
    My knowledge on this should not be superior, any working electrician should have this kind of knowledge!
     
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  13. NDG Elecs
    Offline

    NDG Elecs Electrician's Arms

    Location:
    Tyne and Wear
    You do have a brilliant ability to remember everything DS! That's a compliment by the way. The series/parallel bit is obvious to me in this instance though.

    I have a mate whom, like yourself, can recall detailed facts about everything he has pretty much ever read about/learned.
     
  14. davesparks
    Offline

    davesparks Forum Mentor

    Location:
    guildford
    I don't think so, I would say I have more of an ability to refrain from posting on threads when I don't know the answers, which makes me appear more knowledgeable than people who post up guesses and wrong answers
     
    • Like Like x 1
  15. Leesparkykent
    Offline

    Leesparkykent Super Moderator Staff Member Super Moderator

    Location:
    Kent

    Take it as a compliment Davesparks .
     
    • Like Like x 1
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