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Thread: Wooza's UAS attempt

  1. #1

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    Wooza's UAS attempt

    Hey Santa

    I have been following your progress for a couple of years now. I attempted to construct a waterfall scrubber but because I didn't have a sump I never quite got it to work correctly. I am now in a position to attempt an UAS and have purchased the following in preperation. For some reason I cannot get the LED to light using the products below. Please can you take a look and see where I am going wrong?

    Driver - http://www.ebay.co.uk/itm/2806226159...84.m1497.l2649

    Heatsink - http://www.ebay.co.uk/itm/3006916178...84.m1497.l2649

    LED's - http://www.ebay.co.uk/itm/2209815187...84.m1497.l2649

    Screen - http://www.ebay.co.uk/itm/2008054295...84.m1497.l2649

    Thermal tape - http://www.ebay.co.uk/itm/1407328627...84.m1497.l2649


    I have connected the driver to a two core power cord taken from an old charger I had. I have then connected the driver to one of the LED's but nothing is happening.

    Any help would be greatly appreaciated.

    Thanks

    Liam

  2. #2
    kotlec's Avatar
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    You got driver for led string light. It is 12v.
    To run bare leds you need constant current driver according to LEDs specification. Your LED needs to be driven at 700 ma , so buy driver with 700ma that can handle correct count of LEDs that you plan to use. There always is min and max count of leds for driver to work properly.

  3. #3
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    Yes you'll need to get LED advice...

  4. #4

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    How many leds did you buy, just the two or more ? The driver states that the power output is 0.5 to 12W, so it should handle two leds, but it won't be as efficient as if it were running 4 leds. Typically, you will wire the leds in series, but as Kotlec points out you will be over-driving the leds at 1000mA when they are rated for 700mA. If you have fantastic thermal management you will get away with this for some time, but if not you'll blow the diodes quickly. You could put a power resistor in series with the leds to clamp the current but it will get very hot as it is dissipating nearly 6W of power/heat...not a good solution. You are far better off buying a driver with a rated output of :

    2.2v (the led forward voltage) x the number of leds you are using + 20% and a max current of 700mA. Eg. 2.2v x 2 leds = 4.4v + 20% = 5.28v, ie. 6v, 700mA driver.

  5. #5

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    Thanks for the responses guys, it is greatly appreciated. I am a complete novice to LED's.

    Would this driver suffice?

    http://www.ebay.co.uk/itm/Aurora-1-2...item20c7e5b848

  6. #6
    kotlec's Avatar
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    Yes this will drive 2 LEDs at 700mA .

  7. #7

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    Hi Guys

    I have managed to get the two LED's to light in series and am now in a position to start constructing the scrubber.

    My question is this, is the scrubber intented to completely replace the cannister filter that I am currently using? Or is it a secondary filter to lower the tank nitrates?

  8. #8
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    Depends what you have in the cannister.

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