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LED GU5.3 Lamps Running Off SELV Transformers

Discussion in 'Electrics UK' started by securespark, 30 Apr 2021.

  1. securespark

    securespark

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    I've not installed any new recessed lighting for around a decade and things move on.

    I confess I have not kept my finger on the pulse of SELV and LED lighting.

    The last time I was replacing lamps, LED stuff was in its earlier years.

    I found some LED lamps worked as a direct replacement to a halogen GU5.3 MR16, while others refused to play ball.

    Further down the timeline, the thinking was you could use LED lamps with these transformers as long as they were loaded up to the minimum loading.

    But this is not easy to achieve in many cases.

    Basically, I have some recessed lighting at my Mum's which I installed in 1991. Unbelievably, some of the original lamps are still going, along with all but one or possibly two of the original IBL and Mode Lighting transformers, which I replaced with Osram Halotronic.

    I'm conscious that the old-school halogen lamps burn a lot of juice and a lot of that is wasted as heat.

    Mum would rather not invest in new hardware, so I'm wondering if there is a reliable LED plug and play solution to cut the leccy bill?
     
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  3. bernardgreen

    bernardgreen

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    Is it really wasted ? In winter the heat from lighting does ( slightly ) reduce the gas bill.

    My route when I am finally forced to use LED lighting will be based on the method used for LED strips

    upload_2021-4-30_13-17-31.png

    Three elements in a cluster and a suitable resister.

    Dimming can be easily achieved by varying the DC voltage supplied to the cluster.

    By under running the LED elements ( lower current through them ) increases the life of the elements. Running 12 Volt strips on 9 Volts still gives plenty of light and at the same time assures minimal migrations in the semiconductor structure of the LED elements.
     
  4. JohnD

    JohnD

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    at the expense of paying four of five times the price per kWh, and delivering it to the ceilings, whether or not you need it.
     
  5. securespark

    securespark

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    Yeah, this is heat that is ending in the loft and roof voids
     
  6. bernardgreen

    bernardgreen

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    But some radiated heat does reach the skin. Even if it is 95% phycological the warm white light with a mild heating of the skin does have a good affect on the person.
     
  7. RF Lighting

    RF Lighting

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    I’m not familiar with the transformers you mention. Are they wire wound or electronic? Is it set up with one transformer per light? Can the transformers be easily pulled through the downlighter holes?
     
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  9. securespark

    securespark

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    A couple have one tranny per luminaire.

    Most have one feeding two.

    Yes, everything is accessible from below.

    There is one of three types of tranny:

    Mode Lighting

    IMG_20210424_203525_894.jpg


    IBL (Intram Barwell Limited)

    IMG_20210424_204139_462.jpg


    Osram Halotronic IMG_20210501_222258_826.jpg
     
  10. securespark

    securespark

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    There are some lights in the lounge using "old-fashioned" Thorn steel-cased toroidal trannies, but they're not part of this job.
     
  11. bernardgreen

    bernardgreen

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    Nice to see the mention of the 2 metre limit on cable length.

    upload_2021-5-2_7-5-23.png
     
  12. winston1

    winston1

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    They are all switch mode supplies not suitable for LEDs.

    1. LEDs don’t meet the minimum load requirement.
    2. LEDs usually state 50/60Hz or DC. Those SMPS operate at 10s of KHz.

    You need to get proper LED power supplies or a real (wire wound) transformer.

    Even better replace with 240v GU10 LEDs.
     
  13. bsr

    bsr

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    The obvious solution surely.
     
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