dougp:
It depends. You can run it at higher currents and the voltage will rise with increasing current but unless you have it sitting in a canister of dry ice, heat will quickly kill it à la the post by @be80be. Is there a current limiting resistor in the circuit? A graph of current vs. voltage.
Yes, there is a current limiting resistor.
I just didn't know if there was anything further I needed to do to "set" the voltage drop / forward voltage of the LED to the 2V on the datasheet.
The answer is that the 2V is provided by the LED itself under normal conditions and the recommended current of ~20 mA.
If I had a high voltage source, I just need to worry about limiting the current to the LED safely. The forward voltage will take care of itself.