I used this calculator to calculate resistor values for transistors:http://kaizerpowerelectronics.dk/calculators/transistor-base-resistor-calculator/I thought forward voltage was not operating voltage - just the volts that drops once it's through the LED? I could run a 126.96.36.199v drop led on 5v no?
On another note I could use 50x 5mm LEDs like these:Forward Voltage (V) : 1.2-1.4V.Forward Current (mA): 100mA.
Once again they have 1.2-1.4 forward voltage - could I run them from 5v? If so would the Arduino have enough milliamps to run 50 of them in series and what resistor should I have? Looks to me like they would use 5A.