Results 1 to 5 of 5
  1. #1
    mtbr member
    Reputation: mojojojoaf's Avatar
    Join Date
    Sep 2008
    Posts
    750

    12+ volts to direct drive an MCE?

    I ought an MCE from ledsupply.com and just wanted to test it- it wouldnt light up with my 4cell (parallel wired) pack- so I asked them about it and they said I would need 12+ volts to direct drive test it?

    I was confused and thought I would come here to get a little more enlightenment.... here is the response from ledsupply.com:

    "To direct drive one of our Cree MC-E Stars you need at least 12.8vdc - you don't have enough voltage with your test."

  2. #2
    aka RossC
    Reputation: ocean breathes salty's Avatar
    Join Date
    Oct 2006
    Posts
    936
    Quote Originally Posted by mojojojoaf
    I ought an MCE from ledsupply.com and just wanted to test it- it wouldnt light up with my 4cell (parallel wired) pack- so I asked them about it and they said I would need 12+ volts to direct drive test it?

    I was confused and thought I would come here to get a little more enlightenment.... here is the response from ledsupply.com:

    "To direct drive one of our Cree MC-E Stars you need at least 12.8vdc - you don't have enough voltage with your test."
    Alternatively, you can test each of the dies one at a time by isolating the connectors one at a time. Using the continuity test on your meter is usually the best way.

    Otherwise, if you want to light all 4 at once, then you won't have enough voltage with a 3.7v pack.

  3. #3
    One Gear
    Reputation: .40AET's Avatar
    Join Date
    Jun 2007
    Posts
    1,044
    Wait for a driver to arrive. Less opportunity for misfortune to come your way. On the battery, either use less battery voltage and a boost driver. Or, more battery voltage and a buckpuck. Also, is your battery pack "exactly" 4 batteries with 3volts each?

  4. #4
    mtbr member
    Reputation:
    Join Date
    Sep 2005
    Posts
    236
    More importantly the current running to it unchecked will likely blow out the LED.
    I know this because it happened to me a few years ago, I hooked up a low voltage pack and tried to test the LED without a driver. It lit for a split second and that was it. Time for some new LEDs.
    If your pack is more than 1amp don't connect it. Mine was a 3000mah pack and unchecked it just fried it-too much current!
    Eric S

  5. #5
    mtbr member
    Reputation: mojojojoaf's Avatar
    Join Date
    Sep 2008
    Posts
    750
    Yeah I will wait for my driver to come in. Thanks guys.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •