What Resistor Do I use with my LED

I have a 9 volt 17 watt power supply going to an old game system and I am adding an extra 5 volt LED to it so what resistor should I use to power my 5 volt LED?

Picture of What Resistor Do I use with my LED
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jackillac92 (author) 8 years ago
Thanks!
110100101108 years ago
here. the solution with the less parallel links (usually solution 0) is the most efficient