03-23-2009, 10:16 PM
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Incorrigible Kit Basher
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Join Date: Jul 2006
Posts: 1,888
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Given just an LED and an 820 Ohm resistor such as I used in my launch control system, at 12 volts the maximum current is about 12 mA. My research indicated that I needed to keep the current below 20 mA to avoid burning out the LED; my target was around 15 or so, but I got a good deal on the resistors. I was afraid the LEDs wouldn't be bright enough, but they seem plenty bright in actual service.
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