Newbie's first attempt --> Vista-hack- Mtbr.com
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  1. #1
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    Newbie's first attempt --> Vista-hack

    Hi All - thanks for the inspiration

    As per other threads the bulbs for the old vista lights are becoming difficult and expensive.
    So I thought I'd have a go at a Led buildup.

    The mantra was keep it simple

    - Cree XRE 1000 Kit (1A buckpuck, XR-E (R2-bin), 8deg optic) - from Cutter
    - 2x PentiumV fan heatsinks (fan removed) - from junk heap
    - heatsink compound, epoxy
    - collar off a mains light fitting for a hood

    - Mount heatsinks back-to-back,
    - mount XR-E on one side with heatsink compiound and buck-puck on the other side with epoxy,
    - add some decoupling capacitance (100uF) - this had a ~10% effect on efficiency.
    - wire up and stuff in.







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  2. #2
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    Great idea on the CPU heatsinks! I'll have to look at what I have and how I can drill the holes out to stick some lights in them.

  3. #3
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    - add some decoupling capacitance (100uF) - this had a ~10% effect on efficiency.
    Is that on the battery or LED side of the buckpuck? I noticed my buckpuck wasn't as efficient as I would like but never got around to checking why....

    Toby

  4. #4
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    Decoupling Cap on buck

    Quote Originally Posted by tobymack
    Is that on the battery or LED side of the buckpuck? I noticed my buckpuck wasn't as efficient as I would like but never got around to checking why....

    Toby
    Battery side, as close as possible. I used an axial and soldered to the pins.

    I just used a garden variety electrolytic that I had within arms reach - but it had so much effect I'm thinking that the decoupling is something that needs more work.

    Maybe an ultra low ESR Electro(blackgate?) or Tant could be even better, but you would be chasing the last 1% or 2% with that.

    - Matt

  5. #5
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    Thanks,
    Toby

  6. #6
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    Where did you get that mount, it looks very solid.

  7. #7
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    The mount is just a standard vista mount - I'm pretty sure they are not around any more but there are other mounts around that look similar.
    - Matt

  8. #8
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    http://www.chainreactioncycles.com/M...x?ModelID=6091

    the bar clamp part of this is pretty much the same.

    M

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