Orphek diode change

Discussion in 'Lighting' started by Papitto, 29 Jul 2016.

  1. Papitto

    Papitto

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    Ola!

    I have a question for Orphek users that know more technical info on their products...
    I have a PR-156W (blues and whites), which i think is very old. I bought it off another reefer who had bought it off the original owner who is also a member. cant remember his name.
    I'm only to assume that this unit was manufactured in 2010 if i'm correct, which is now +-6 years old.

    I have a number of cree 3W diodes that I am wondering if possible to change the original diodes on the unit for these cree diodes. I know that the orphek diodes are under-run @ 2w, but not sure what the constant current (mVa) is.

    Question is, is this possible to just swop out or is there considerations I need to make? Or do you think this unit is still fine?
     
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  3. hotdog83

    hotdog83 Clone Fish

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    I would assume it will be fine to change them, especially if they only run at 2w. Some of the newer Cree 3w chips can run at 1Va I think, and don't think less of a current will be an issue, just less bright than at 1Va. To run at 2w I assume the current for that unit should be around 500mVa on a 12v input voltage? Do you have a multimeter to test it?
     
  4. Papitto

    Papitto Thread Starter

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    Yes I do have one, will open up and test current through each diode.
     
  5. Papitto

    Papitto Thread Starter

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    Forward curr
    Forward current @500mVa
     
  6. RossK

    RossK

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    Would just like to find out what exactly is the mVa you guys are referring to.
    Following this thread but a bit lost on just that...
     
  7. leslie hempel

    leslie hempel Moderator MASA Contributor

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    you can mail orphek and ask.

    safrica@orphek.com they will enquire from the manufacturer for you.
     
  8. Papitto

    Papitto Thread Starter

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    Forward current measured in milli Volt-ampere i.e. mVa
     
  9. RossK

    RossK

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    Fwd current is measured in amps or mA. Never seen it expressed this way before. But as long as everybody is on the same page, you could call it bananas and still get the answers you need :slayer:.

    Any measurements on the current on your existing setup yet?
    Under correction here but I think most white/ blue Cree 3W LED's need 3.3 volts @ 700mA for maximum power.
    If you have not done so already, you can measure forward current through the LEDs, this needs to be measured in series with any of the LEDs. And then you can measure the voltage across the whole string of LEDs and divide by the number of LEDs in that string. That will give you the voltage drop across each LED. Easy to decide on replacements if you have this info.

    If you already know how to do this, sorry for my speech above :001_cool:
     
    Last edited: 29 Jul 2016
  10. Papitto

    Papitto Thread Starter

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    Lol that just switched my lightbulb off.
    I will mail Linda at Orphek and ask for advise
     
  11. RossK

    RossK

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    Sorry, didn't want to make things difficult for you. It's the only way to determine replacement LED's without having the specs of the original.
    I will be back in South Africa in 2 weeks time. If you not sorted by then, PM me. I will try to help.
    I don't live in Jhb, but in an out of Weltervreden Park and Helderkruin every so often. I can always detour a little...
     
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