There are many different options for controlling an LED. If the current is small, and the power dissipated not very great, a simple resistor would suffice.
A resistance in series with the LED will limit the current through it. One must make sure there is adequate voltage across the LED to it on. A quick look at the data sheet can tell a person a voltage and a current to go along with that voltage, using the voltage current characteristics graph. Then all they have to do is subtract that voltage from the power supply, and find the resistance value that will allow that specified current through for that amount of voltage.
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Electrical Design Engineer, Minneapolis, Minnesota
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