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Reply to "MTH- HOT HEADLIGHT MELTED CAB"

Marty, I'm not sure where they came up with the value of 560 for the resistor.  Obviously, you'll get plenty of light with that value, but the PWM drive to the bulb results in an effective voltage of about 6 volts.  Most common LED's have a peak forward current of 100ma or more, the roughly 20-22 volts on the PV that is PW modulated results in a peak current through the LED of less than 90ma using a 220 ohm resistor, well within the ratings of the LED.  I typically use a 270 ohm resistor for a little larger margin of error, the peak current ends up being less than 75ma, and the average current is around 14-15ma.

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