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Thread: 3w Red led`s

  1. #1

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    3w Red led`s

    I received some 3w red led`s today (typ 2.2v,750mA) ,wired them up to a driver (680mA).
    When switched on they contiuously flash on and off,which seems like a constant rate, does anyone have any idea whats at fault,i.e. led`s,driver or my soldering ?

    Thanks

  2. #2
    kerry's Avatar
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    Re: 3w Red led`s

    Did you get the driver from ebay? topledlights? My driver did the same thing!!! He tried to say I hooked them up wrong, I put it in the mail today.
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  3. #3

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    Re: 3w Red led`s

    LED-DNA

  4. #4
    kerry's Avatar
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    Re: 3w Red led`s

    I think they had some of the same brand, mine was red. Either way, I am using a 12V 500ma wall wart for the time being. I think I am going to order one from rapidled.com .
    150G. Reef/Mix
    125G. 3 Regular Oscars/1 Jack Dempsey
    75G. 20+ Africans
    40G. Fish/Reef. Algae Scrubbers on ALL my SW
    10G. SW Fish/Reef.
    10G. SW Hospital/new fish quarantine/pod breeder tank
    6 stage RO/DI system 200 GPD.

  5. #5
    kotlec's Avatar
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    Re: 3w Red led`s

    Usually driver does that when voltage is too low or too high to drive leds. I mean too many or too few leds as per specification.

  6. #6

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    Re: 3w Red led`s

    Quote Originally Posted by kotlec
    Usually driver does that when voltage is too low or too high to drive leds. I mean too many or too few leds as per specification.
    +1
    What are the specs? We can probably help.

  7. #7

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    Re: 3w Red led`s

    I guess the spec`s of driver or led`s are wrong then,I placed a resistor inline with output for a few seconds and they stopped on.

  8. #8

  9. #9

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    Re: 3w Red led`s

    That driver is rated 20V to 36V on the output.
    Dc forward voltage on the LEDs is rated 2.2V to 2.4V.

    Minumum LEDs:
    20V / 2.2V = 9 LEDs.

    Maximum LEDs:
    36V / 2.4V = 15 LEDs.

    Those are theoretical. My guess is more like 7-16 would be fine.

    Alternately, you can put a resistor inline as it sounds like you did.
    But make sure it is pretty high power.

  10. #10

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    Re: 3w Red led`s

    I checked the voltage drop across array and diodes,its running at 18v and 1.8v per diode so I`m going to add more led`s to take it over the drivers 20v minimum.
    Adding a couple more led`s wont do my total wattage any harm :roll:

    Thanks for running through it with me

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