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UV LED wiring help - four pin fan header

post #1 of 5
Thread Starter 
Hello, as I'm sure this has been asked before, please direct me to the correct thread. If not, then I hope you guys can help. I recently procured some UV LEDs in the mail and intend on installing them in my case, via a four pin fan header. I have already figured out which wire is the positive (12v) and which is the ground, however when i tested to make sure I was correct the LED burned bright orange instead of UV and quickly burned out. My question is will more LEDs solve this issue by distributing the power among more bulbs, and if not, what will? If more LEDs are the solution, how would I go about wiring them?

LED specs
Typical Voltage (vf) : 3.0-3.6
Current (mA): 20
Luminous Intensity (mcd): 3500-5000
View Angle (degrees): 11
Wavelength (nm): 400-410

I pulled all of that information from the manufacturer. I'm unsure as to how much of it is actually relevant.
post #2 of 5
So you fed a LED that was rated for 3V to 3.6V with a 12V source? biggrin.gif It must have glown pretty bright before it popped.

And now back to your question/problem.... It's not really too big of an issue; all you need is to figure out how many LEDs you'll be using, how you're going to wire them (serial vs parallel) and you're on your way. I recommend wiring them in parallel; that way if one dies the rest will still work.

With that information in hand you then go to this site: http://www.hebeiltd.com.cn/?p=zz.led.resistor.calculator

Plug your information into the appropriate fields and the calculator will give you the value of the resistor you need to use in order to have your LEDs work how they are supposed to and not pop like it did on your first try.

Here's an example of what you would need for 6 of your LEDs in parallel...
2iu6gyg.jpg
Edited by xXSebaSXx - 8/9/11 at 4:12pm
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post #3 of 5
Thread Starter 
We're all new at some point, right? Anyway, thank you for this. It's been very helpful. smile.gif
post #4 of 5
Quote:
Originally Posted by tommyfarris;14524556 
We're all new at some point, right? Anyway, thank you for this. It's been very helpful. smile.gif

Of course... I had my "noob" moment with a Pentium 4 that blew pretty blue smoke after I carelessly powered it while the motherboard was wet after cleaning.... Live and learn is what I say... Good thing about your experience is that it only cost you the $1 or $2 that you paid for the LED and it brought you here to learn how to do it right.

applaud.gif
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post #5 of 5
I personally would say to wire the LEDs in series strings; 4 of those in series will work fine on a +12V supply and you won;t even need a resistor.
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