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LED in series?

post #1 of 7
Thread Starter 
Ok IIRC if u have say 4 leds going on a fan and they are 3v led's and ur running them off ur PSU on the 12v rail u do not need a resistor if u run them in series ?
post #2 of 7
LED calculator right here
http://led.linear1.org/led.wiz
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post #3 of 7
Thread Starter 
says i need a 1ohm resistor which means no resister correct?
post #4 of 7
you should need about 2 270 ohms resistors.
whats the specs on your led's?
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post #5 of 7
Thread Starter 
3v 30ma ..... but if im correct the 12v rail will reduce down to 3watts per led in series 12/4 = 3
post #6 of 7
you should be fine then
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post #7 of 7
If the sum of the voltage drops across the LEDs in series is equal to the supply voltage, then you do not need any resistor.
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