LED driver based on LM317 gives more voltage than required?
The driver was based on https://www.instructables.com/id/Super-simple-high-power-LED-driver/
When powered up, the current across led was around 290ma but the voltage across the led was 4.33v whereas it should be between 3.0-3.6v according to the led datasheet.
What am I doing wrong? Is it safe to run the led at 4.33v ? It was getting hot.