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Trying to figure out how to wire up LEDs in series to light my computer..

Discussion in 'LEDs and Optoelectronics' started by jkjd1234, Jan 17, 2013.

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  1. jkjd1234

    jkjd1234

    2
    0
    Jan 17, 2013
    Hello,

    I've got 5 LEDs that I am trying to figure out how to wire in series, and I think I have it figured out but since I'm new to this kind of stuff I wanted to ask to be sure.

    The LED model is : http://www.ledsupply.com/lxm3-pw51-90.php

    The driver is: http://www.ledsupply.com/bucktoot.php

    The supply voltage will be 24v.

    So from what I've gathered, I need to get 22 ohm/5 watt resistors.

    Is that correct, or did I miss something?
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,401
    2,777
    Jan 21, 2010
  3. jkjd1234

    jkjd1234

    2
    0
    Jan 17, 2013
    Alright thanks for posting that.
    After reading through, I realize that I don't need a resistor at all because of the driver.
    Also, I can't do 24v IN (just don't have it) so I'll need to use 12v, which means that I can only power 3 of those LEDs in series because of the voltage forwarding. I'll just have to get another driver for the other 2.
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,401
    2,777
    Jan 21, 2010
    Yes, that will be a solution. But first check that it will reliably drive three from 12V. You're getting close to the limit there, and any sag in your input voltage is likely to affect things. This would be very visible if you have two of these connected to a second driver as those would keep getting the full current down to (perhaps) 8V.

    You could either get 3 drivers (2 powering 2 LEDs and 1 powering 1 LED) or get an additional LED and have both powering three (that way the dimming would be the same for both). Or, you might find it not to be an issue. If it is going to be difficult to change later if there is a problem, I would recommend you test stuff "on the bench" first to see if there's an issue.
     
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