I think the easiest way would be to use resistors. Figure that the resistor is going to drop about 10 volts, the forward voltage of the LED is about 3.5 volts. I wouldn't use such a powerful LED either. Get some ones that use about 10-30ma.
Something like these: 5mm LED RL5-W8045 Specifications
Figuring 15ma and 10 volts you might choose a resistor around 600 ohms with a wattage of 1/4 watt or larger. I like using one resistor per LED.
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Last edited by Varn; 11-24-2010 at 11:28 AM..
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