I measured a voltage of 5.68 volts output from the power supply with no load. From what I've read online, the +5V pin on the Arduino can take up to 5.5V input. if I supply 5.68V, do I risk burning out the Arduino? Is there any way I can reduce the voltage going into the Arduino?
Alternatively I considered supplying 9V to Vin on the Arduino, then power the LEDs from the +5V pin, however I am concerned that all twenty LEDs at full power might draw more current that the Arduino could provide (20 x 60mA = 1200 mA?).