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LED Resistor size??

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Old 04-22-2005, 01:16 PM
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LED Resistor size??
I just received from superbright.com R:5-B2545 LED's there 2500 mcd. I have no idea what size resistor to use. Could someone help me out. THanks
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Old 04-22-2005, 01:37 PM
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(Car elec. supply =12V) - (# Bulbs in Series)x(Working Voltage) = Excess Voltage

(Excess Voltage)/(Desired Current Flow) = Ohms resistor needed
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Old 04-22-2005, 03:28 PM
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or if you're lazy, here's a calculator...
http://linear1.org/ckts/led.php

use this one if you want to hook up more than 1 led...
http://led.linear1.org/led.wiz
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