You just do it like how I described. That's why I said turn down the pot. You start at a high resistance where nothing will blow and slowly turn it down. Nothing says that you have to turn it down until the LED is destroyed.Ron,
Thank you but I do know how to integrate an LED into a circuit. What I'm trying to figure out is for a random LED, what the Vf and If are without ending up going dknguyen's route and blowing up the LED.