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Originally Posted by Tom Line;1006944...
Alan - you're probably the right person to ask. We were also considering using a flashlight of some sort, however, you can't get the actual resistance of LED's with a multimeter, so I don't know how to go about voltage dividing them with a resistor so they get the proper voltage from a spike.
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LEDs don't have a resistance. Being diodes, they have a specific voltage drop. That's something you can measure. If your multimeter doesn't have a "diode" scale that goes high enough, you can try a 12 volt supply through a 1k series resistor and the LED. That will limit the current to no more than 12 milliamps, and you can measure the voltage across the LED directly.