I'm setting up my led cube and wanted to test with a few extra leds before hooking up my time intensive cube. FYI I am a computer scientist not an electrical engineer. I would like to make sure my numbers look correct.
LED SPECS: Forward Voltage (V) : 3.2 ~ 3.8 Reverse Current (uA) : <=30 Forward Current : 30mA Max Peak Forward Current : 75mA Reverse Voltage : 5~6V
POWER SUPPLY SPECS: 5v 3.8A
I connected one led to the supply with with two 100ohm resisters all in series. When I measured the current I got 9.4mA and for voltage across the resistor I got 3.14v
Do I need less or more resistance or is it ok? The spec sheet says 30mA forward voltage so I would assume I could stick with 100hm per resister.