I see, that makes sense about the forward voltage drop.
I must've gotten careless with my math, maybe hit the wrong button on my desktop calculator or something.
I've visited the store where I'm buying my leds, but they don't seem to show any graphs or charts when I look up the specs. Is there mathematical way to find the forward voltage drop given these specs?:
Blue 45° 5mm LED: Wavelength: 470nm
Luminous Intensity: 800mcd typ. @ 20mA
Max Forward Current: 30mA
Pulse Current: 100mA for <= 10ms, duty <= 1/10
Forward Voltage: 3.6V typ. 4.0V max @ 20mA
Max Reverse Voltage: 5V
Power Dissipation: 120mW
Operating Temp: -30 to +85 C
Soldering Temp: 265 C for 10 secs
Max Reverse Current: 50uA @ 5V
It's a blue led.
I'm also buying a few that are green.