Since you don't appear to be controlling the LEDs with the Arduino (the LEDs are powered-on whenever the Arduino is powered-on), you can simply connect the LEDs to the 5V power supply, instead of going through the Arduino's regulator.
Since you don't appear to be controlling the LEDs with the Arduino (the LEDs are powered-on whenever the Arduino is powered-on), you can simply connect the LEDs to the 5V power supply, instead of going through the Arduino's regulator.