LED Problem

Discussion in 'Tech/Mech General' started by Tootles, Mar 25, 2016.

  1. Tootles

    Tootles Funster

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    Heres one to tax you eggheads. In our Hymer bathroom, there is a strip four bulb holder mounted vertically next to the sink.

    hymer bathroom.jpg

    And so, I decided in the interests of power saving and increased light, to replace the bulbs with four of these LEDs..........(12 volt, 5 watt)

    $_12.JPG

    But they wont work! Tried them in the sidelights, they work. In the overbed spotlights, fine, but not in the bathroom, either together, or just as a single. Reversed the polarity, nothing........Cant understand it. The standard filament bulbs in the unit are rated at 12 volt 5 watt each.......Any ideas??
     
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  2. John Laidler

    John Laidler Funster

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    Have you fused anything? Check by putting one of the old bulbs in and see if it glows in a bulby sort of way.

    Also try covering the mirror. Your reflection may the problem. :)
     
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  3. DuxDeluxe

    DuxDeluxe Funster Life Member

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    Tootles doesn't have a reflection when in front of the mirror........ ;)
     
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  4. John Laidler

    John Laidler Funster

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    On a more serious note put the two different bulbs next to each other and check the dimensions and contacts are identical.

    We've got a fancy bathroom light which needed a new fluorescent tube. Could I get one the right size locally? Had to get it online. Your make-up lights might be something odd. Close to a standard bulb but subtly different for maximum bu**eration factor. Probably Italian like our bathroom light. :)
     
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  5. DuxDeluxe

    DuxDeluxe Funster Life Member

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    That is distressingly sensible advice.............:LOL:
     
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  6. John Laidler

    John Laidler Funster

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    I will try to do better in future....:unsure:
     
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  7. Tootles

    Tootles Funster

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    Everything is identical to the standard filament bulbs. Tested the output from each bulb holder, all the same. I'm starting to wonder if this light unit, (the only power into the bathroom), is somehow controlled by a resistor unit that is not compatible to LEDs. ??????
     
  8. pappajohn

    pappajohn Funster Life Member

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    If the led's are rated at 5 watts and the original filiment bulbs are rated at 5 watts.....what do you hope to gain ?
    5 watts is 5 watts.
     
  9. Tootles

    Tootles Funster

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    The 5 watts refers to the light output John. LED's use a smaller proportion of power then filament bulbs, because there's nothing to heat up. And so I would be getting the same amount of light for less power used.
     
  10. pappajohn

    pappajohn Funster Life Member

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    Ok, that clears that up.
    I thought you meant input watts.
    A 12v 5watt led is equivilent to around 40 watts.

    I cant see any reason for the circuit to include a resistor.....thats generally reserved for led road lighting with a canbus bulb failure system so the system still sees a regular bulbs resistance thus not thinking a bulb has failed.
     
  11. Gorse Hill

    Gorse Hill Funster

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    Are they transformer operated toots, do they work without being on EHU
     
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  12. Tootles

    Tootles Funster

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    Yes mate, they do. I cant think of rhyme or reason for them not working.
     
  13. CeeJay13

    CeeJay13 Read Only Funster

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    Is there a dimmer on this circuit? Some LEDs don't like them.
     
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  14. Borderland

    Borderland Funster

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    Have you tried putting back the original bulbs and then swapping just one of them for the LED type. It may be that you have a control circuit (could be a dimmer or some sort of voltage control) that needs a minimum current drawn from it to make it work and the LED current requirements may be below this.
     
  15. Hymie

    Hymie Funster

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    Toots, where did you get the led lamps from?

    We have the same bathroom as you, bottom lamp is almost dead now so was thinking of changing them to LED's.

    If I can buy some the same I will try them in ours and see what happens
     
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  16. berni109

    berni109 Funster

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    you need a bit of trial and error testing mate.
    put all originals back in - take 1 out and replace with (previously tested) led.
    if ok and lights continue with next and so on.
    if not working with even 1 led and 7 filament you will have to get to the wiring behind the fitting and see how its all connected up (yes i know pain in the arse)
    how about putting a strip of self adhesive led down each side inside the fitting and connecting directly to the switch supply.
    not had a similar problem myself but hope that gives u food for thought.
    bern
     
  17. Tootles

    Tootles Funster

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    No dimmer, but a hell of a sized switch for the job, which makes me think it may 'contain' some other circuit 'nasty'.......

    Yes, tried all that. The filament bulbs will work, but the LED alongside will not.

    Got them off ebay. Just input 12volt 5 watt LED vehicle bulbs. (y) (Sorry, I cant get ebay up at the mo).

    Thanks Bern. My next job will be to take a feed from before the switch, and see if lights an LED. If so, the (huge) switch must either have a resistor fitted, or some other voltage stabilizing device. (y)
     
  18. Borderland

    Borderland Funster

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    It seems as if the bulbs aren't making contact with the holders. Are the solder pips at the bottom of the bulb as prominent as the bulbs you are replacing. I once had a problem when replacing the bulb on some ophthalmic equipment and after messing around for quite a while I found out the bulbs were fractionally shorter and not making contact. I re-soldered the bottom of the bulb to build up the depth and that sorted the problem. It could be that the bulb holders are slightly different to others in your vehicle and that is why they work in some places and not others.
     
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  19. Enword

    Enword Funster

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    LED's wont work if + & - are reversed
     
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  20. Tootles

    Tootles Funster

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    Tried that as well........And funny, neither did the original filament bulbs, which quite surprised me! Something in the circuit I'm missing.
     
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