Am 20.05.2010 10:20, schrieb Invisible:

> Right. So I'm looking at 2.1 V or 2.2 V or thereabouts.

Make sure to leave some margin for tolerances; resistors may have 
tolerances up to 10% (though 5% seem to be more common nowadays), and 
your power supply might be more (or less) than 5V as well. You don't 
want to kill your LED just because its actual "lethal" forward current 
happens to be pretty close to nominal, while the power supply and 
resistor parameters happen not to be.

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